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<div style="font-family:Times New Roman;">
 <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0pt 0pt 0pt 0pt;"> <p align="right" style="border:none;margin:0pt 0pt .0001pt;padding:0pt;text-align:right;"><a name="scotch"><font size="2" face="Times New Roman">Registration No. 333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></a></p> </div>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br>
SECURITIES AND EXCHANGE COMMISSION</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
D.C. 20549</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM S-8</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933</font></b></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">PACCAR Inc</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of
registrant as specified in its charter)</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="font-size:10.0pt;margin:0pt 0pt .0001pt;text-align:center;"><!-- SET mrlNoTableShading --><b>Delaware</b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">91-0351110</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other
  jurisdiction of<br>
  incorporation or organization)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer
  Identification No.)</font></p>
  </td>
 </tr>
</table>

</div>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<div align="center">

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="font-size:10.0pt;margin:0pt 0pt .0001pt;text-align:center;"><!-- SET mrlNoTableShading --><b>777&#150;106th Avenue N.E.<br>
  Bellevue, Washington</b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">98004</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of
  Principal Executive Offices)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt .7pt;width:2.38%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt .7pt;width:48.8%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Zip Code)</font></p>
  </td>
 </tr>
</table>

</div>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PACCAR Inc Savings Investment
Plan</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Full title of the
plan)</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Kevin J. Fay<br>
PACCAR Inc<br>
777 106th Ave. N.E.<br>
Bellevue, WA&#160; 98004</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Name and address
of agent for service)</font></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(425) 468-7607</font></b></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Telephone Number,
including area code, of agent for service)</font></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CALCULATION OF
REGISTRATION FEE</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="31%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:31.88%;">
  <p style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><!-- SET mrlNoTableShading -->Title&nbsp;of<br>
  securities&nbsp;to<br>
  be&nbsp;registered(1)</p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:14.68%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Amount&nbsp;to&nbsp;be<br>
  registered(2)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:14.52%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Proposed<br>
  maximum&nbsp;<br>
  offering&nbsp;price<br>
  per&nbsp;share</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="14%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:14.52%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Proposed<br>
  maximum&nbsp;<br>
  aggregate<br>
  offering<br>
  price(3)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="14%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:14.52%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Amount&nbsp;of<br>
  registration<br>
  fee(4)</font></b></p>
  </td>
  <td width="0%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="31%" valign="top" style="border:none;padding:0pt .7pt 0pt 0pt;width:31.88%;">
  <p style="margin:0pt 0pt .0001pt 10.0pt;page-break-after:avoid;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Common Stock, $1 par
  value(5)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:14.68%;">
  <p align="center" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">12,000,000
  shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:14.52%;">
  <p align="center" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not
  applicable</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-top:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.54%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">787,980,000</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="border:none;padding:0pt 0pt 0pt 0pt;width:1.0%;">
  <p align="left" style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:left;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="13%" valign="bottom" style="border:none;border-top:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:13.54%;">
  <p style="margin:0pt 0pt .0001pt;page-break-after:avoid;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">84,313.86</font></p>
  </td>
  <td width="0%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:.34%;">
  <p style="margin:0pt 0pt .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="239" style="border:none;"></td>
  <td width="18" style="border:none;"></td>
  <td width="110" style="border:none;"></td>
  <td width="18" style="border:none;"></td>
  <td width="109" style="border:none;"></td>
  <td width="18" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
  <td width="101" style="border:none;"></td>
  <td width="18" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
  <td width="101" style="border:none;"></td>
  <td width="2" style="border:none;"></td>
 </tr>
</table>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<div style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><hr size="1" width="160" noshade color="black" align="left" style="width:120.0pt;"></div>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pursuant
to Rule 416(c) under the Securities Act of 1933, as amended (the &#147;Securities
Act&#148;), this registration statement also covers an indeterminate amount of
interests to be offered or sold pursuant to the employee benefit plan described
herein.</p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Includes
an indeterminate number of additional shares that may be issued to adjust the
number of shares issued pursuant to the employee benefit plans described herein
as the result of any future stock split, stock dividend or similar adjustment
of the Registrant&#146;s outstanding common stock.</p>

<p style="font-size:10.0pt;margin:0pt 0pt .0001pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
solely for the purpose of calculating the registration fee.</p>

<p style="margin:0pt 0pt .0001pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0pt 0pt .0001pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
pursuant to Rules 457(c) and 457(h) under the Securities Act solely for
purposes of calculating amount of registration fee, based upon the average of
the high and low prices reported on December 18, 2006, as reported on The
NASDAQ Stock Market.</p>

<p style="margin:0pt 0pt .0001pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0pt 0pt 12.0pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(5)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Includes
preferred stock purchase rights.</p>

<p style="margin:0pt 0pt .0001pt 36.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>


 <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0pt 0pt 0pt 0pt;"> <p style="border:none;margin:0pt 0pt .0001pt;padding:0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p> </div>
</div><br><hr size="3" width="100%" noshade color="#010101" align="center">

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<div>
 <p style="margin:0pt 0pt .0001pt;text-align:center;"></p>

<p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">REGISTRATION OF
ADDITIONAL SECURITIES</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0pt 0pt .0001pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Registration
Statement relates to the registration of additional securities under the PACCAR
Inc Savings Investment Plan.&#160; In
accordance with General Instruction E of Form S-8 under the Securities Act, the
contents of the previous Registration Statement on Form S-8 related to the
Savings Investment Plan (Registration No. 333&#151;52230, filed with the Securities
and Exchange Commission on December 20, 2000) are incorporated herein by
reference and made part of this Registration Statement, except as amended
hereby.</font></p>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The following
documents are filed as exhibits to this Registration Statement:</font></p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 72.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>PACCAR
Inc Savings Investment Plan (incorporated by reference to Exhibit 10(i) to the
Quarterly Report on Form 10-Q for the period ended September 30, 2005).</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 72.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Rights
agreement dated as of December 10, 1998 between PACCAR Inc and First Chicago
Trust Company of New York setting forth the terms of the Series A Junior
Participating Preferred Stock, no par value per share (incorporated by
reference to Exhibit 4.1 of the Current Report on Form 8-K dated December 21,
1998).</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 72.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.3</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Amendment
Number 1 to rights agreement dated as of December 10, 1998 between PACCAR Inc
and First Chicago Trust Company of New York appointing Wells Fargo Bank N.A. as
successor rights agent, effective as of the close of business September 15,
2000 (incorporated by reference to Exhibit (4)(b) of the Quarterly Report on
Form 10-Q for the period ended September 30, 2000).</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 72.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Consent
of Ernst &amp; Young LLP, Independent Registered Public Accounting Firm.</p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt 72.0pt;text-indent:-36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Power
of Attorney.</p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In lieu of an
Internal Revenue Service (&#147;IRS&#148;) determination letter that the Plan is
qualified under Section 401 of the Internal Revenue Code, the undersigned Registrant
hereby undertakes that it will submit the Plan and the amendments thereto to
the IRS in a timely manner and will make all changes required by the IRS to
qualify the Plan.</font></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></p>

<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Registrant</font></u>.</p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
requirements of the Securities Act of 1933, the Registrant certifies that it
has reasonable grounds to believe that it meets all of the requirements for
filing on Form S-8 in relation to the PACCAR Inc Savings Investment Plan and
has duly caused this registration statement on Form S-8 to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Bellevue,
State of Washington, on this 19th day of December, 2006.</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="42%" colspan="2" valign="top" style="padding:0pt .7pt 0pt 0pt;width:42.36%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" colspan="2" valign="top" style="padding:0pt .7pt 0pt 0pt;width:42.36%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" colspan="2" valign="top" style="padding:0pt .7pt 0pt 0pt;width:42.36%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="margin:0pt 0pt .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:1.0pt;"><font style="text-decoration:none;">&nbsp;</font></font></u></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:39.4%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ J. M.
  D&#146;Amato</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="margin:0pt 0pt .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:1.0pt;"><font style="text-decoration:none;">&nbsp;</font></font></u></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.4%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">J. M. D&#146;Amato</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.64%;">
  <p style="margin:0pt 0pt .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:1.0pt;"><font style="text-decoration:none;">&nbsp;</font></font></u></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.4%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Secretary</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>


 <p style="font-size:10.0pt;margin:24.0pt 0pt .0001pt;text-align:center;"><font face="Times New Roman">2</font></p> <br><hr size="3" width="100%" noshade color="#010101" align="center">

<!-- SEQ.=1,FOLIO='2',FILE='C:\Fc\353221539951_P66471CHE_1567119\25525-1-bc.htm',USER='jmsproofassembler',CD='Dec 19 22:15 2006' -->
<br clear="all" style="page-break-before:always;">
 <p style="margin:0pt 0pt .0001pt;text-align:center;"></p>


<p style="margin:0pt 0pt .0001pt;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<p style="margin:0pt 0pt .0001pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
requirements of the Securities Act of 1933, this registration statement has
been signed by the following persons in the capacities indicated on December 19,
2006.</font></p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="left" style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:left;"><!-- SET mrlNoTableShading -->Signature</p>
  </td>
  <td width="6%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="48%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Title</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ M. C. Pigott</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman and Chief Executive Officer<br>
  (principal executive officer)</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">M. C. Pigott</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice Chairman</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ M. A. Tembreull</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(principal financial officer)</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">M. A. Tembreull</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ R. E. Armstrong</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice President and Controller</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">R. E. Armstrong</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(principal accounting officer)</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A. J. Carnwath</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">J. M. Fluke, Jr.</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">S. F. Page</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">R. T. Parry</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">J. C. Pigott</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">W. G. Reed, Jr.</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">H. A. Wagner</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director, PACCAR Inc</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="45%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:45.62%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">C. R. Williamson</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:6.2%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:48.18%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0pt 0pt .0001pt;page-break-after:avoid;"><hr size="1" width="160" noshade color="black" align="left" style="width:120.0pt;"></div>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="5%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:5.36%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading -->*By:</p>
  </td>
  <td width="40%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:40.26%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ M. C. Pigott</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.4%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="5%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:5.36%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="40%" valign="top" style="border:none;padding:0pt .7pt 0pt 0pt;width:40.26%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">M. C. Pigott<br>
  Attorney-in-fact</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.4%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:50.98%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>


 <p style="font-size:10.0pt;margin:24.0pt 0pt .0001pt;text-align:center;"><font face="Times New Roman">3</font></p> <br><hr size="3" width="100%" noshade color="#010101" align="center">

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 <p style="margin:0pt 0pt .0001pt;text-align:center;"></p>


<p style="font-family:Times New Roman;font-size:10.0pt;margin:0pt 0pt 12.0pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Plan</font></u>.</p>

<p style="margin:0pt 0pt 12.0pt;text-indent:36.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
requirements of the Securities Act of 1933, the trustees (or other persons who
administer the employee benefit plan) have duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Bellevue, State of Washington, on December 19, 2006.</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="font-size:10.0pt;margin:0pt 0pt .0001pt;"><!-- SET mrlNoTableShading --></p>
  </td>
  <td width="42%" colspan="2" valign="top" style="padding:0pt .7pt 0pt 0pt;width:42.96%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PACCAR INC SAVINGS INVESTMENT PLAN</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:1.0pt;"><font style="text-decoration:none;">&nbsp;</font></font></u></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ M. C. Pigott</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="border:none;padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">M. C. Pigott</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman and Chief Executive Officer</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="57%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:57.04%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:3.46%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:39.5%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PACCAR Inc</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0pt 0pt 12.0pt 235.0pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0pt 0pt 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">INDEX TO EXHIBITS</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;font-family:Times New Roman;width:100.0%;">
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="left" style="font-size:8.0pt;font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:left;"><!-- SET mrlNoTableShading -->Exhibit<br>
  Number</p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="87%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">Description</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></b></p>
  </td>
  <td width="87%" valign="bottom" style="border:none;padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="font-weight:bold;line-height:8.0pt;margin:0pt 0pt .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PACCAR Inc Savings Investment Plan (incorporated by
  reference to the Quarterly Report on Form 10-Q for the period ended September
  30, 2005).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rights agreement dated as of December 10, 1998
  between PACCAR Inc and First Chicago Trust Company of New York setting forth
  the terms of the Series A Junior Participating Preferred Stock, no par value
  per share (incorporated by reference to Exhibit 4.1 of the Current Report on
  Form 8-K dated December 21, 1998).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.3</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment Number 1 to rights agreement dated as of
  December 10, 1998 between PACCAR Inc and First Chicago Trust Company of New
  York appointing Wells Fargo Bank N.A. as successor rights agent, effective as
  of the close of business September 15, 2000 (incorporated by reference to
  Exhibit (4)(b) of the Quarterly Report on Form 10-Q for the quarter ended
  September 30, 2000).</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of Ernst &amp; Young LLP, Independent Registered
  Public Accounting Firm.</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="9%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:9.94%;">
  <p align="center" style="margin:0pt 0pt .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:2.38%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0pt .7pt 0pt 0pt;width:87.68%;">
  <p style="margin:0pt 0pt .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power of Attorney.</font></p>
  </td>
 </tr>
</table>

<p style="margin:0pt 0pt 12.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>


 <p style="font-size:10.0pt;margin:24.0pt 0pt .0001pt;text-align:center;"><font face="Times New Roman">4</font></p>
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[{"type": "S-8", "sequence": "1", "filename": "a06-25525_1s8.htm", "description": "SECURITIES TO BE OFFERED TO EMPLOYEES PURSUANT TO EMPLOYEE BENEFIT PLANS", "secsgml_size_bytes": 73880}]
{"company-data": {"conformed-name": "PACCAR INC", "cik": "0000075362", "assigned-sic": "3711", "irs-number": "910351110", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-139544", "film-number": "061292162"}, "business-address": {"street1": "PACCAR BUILDING", "street2": "777 106TH AVENUE NE", "city": "BELLEVUE", "state": "WA", "zip": "98004", "phone": "425 468 7383"}, "mail-address": {"street1": "PACCAR BUILDING", "street2": "777 106TH AVENUE NE", "city": "BELLEVUE", "state": "WA", "zip": "98004"}, "former-company": {"former-conformed-name": "PACIFIC CAR & FOUNDRY CO", "date-changed": "19720707"}}
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington,
D.C. 20549
FORM S-8
REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933
PACCAR Inc
(Exact name of
registrant as specified in its charter)
Delaware
91-0351110
(State or other
  jurisdiction of
incorporation or organization)
(I.R.S. Employer
  Identification No.)
777–106th Avenue N.E.
Bellevue, Washington
98004
(Address of
  Principal Executive Offices)
(Zip Code)
PACCAR Inc Savings Investment
Plan
(Full title of the
plan)
Kevin J. Fay
PACCAR Inc
777 106th Ave. N.E.
Bellevue, WA  98004
(Name and address
of agent for service)
(425) 468-7607
(Telephone Number,
including area code, of agent for service)
CALCULATION OF
REGISTRATION FEE
Title of
securities to
be registered(1)
Amount to be
registered(2)
Proposed
maximum
offering price
per share
Proposed
maximum
aggregate
offering
price(3)
Amount of
registration
fee(4)
Common Stock, $1 par
  value(5)
12,000,000
  shares
Not
  applicable
$
787,980,000
$
84,313.86
(1)
Pursuant
to Rule 416(c) under the Securities Act of 1933, as amended (the "Securities
Act"), this registration statement also covers an indeterminate amount of
interests to be offered or sold pursuant to the employee benefit plan described
herein.
(2)
Includes
an indeterminate number of additional shares that may be issued to adjust the
number of shares issued pursuant to the employee benefit plans described herein
as the result of any future stock split, stock dividend or similar adjustment
of the Registrant's outstanding common stock.
(3)
Estimated
solely for the purpose of calculating the registration fee.
(4)
Estimated
pursuant to Rules 457(c) and 457(h) under the Securities Act solely for
purposes of calculating amount of registration fee, based upon the average of
the high and low prices reported on December 18, 2006, as reported on The
NASDAQ Stock Market.
(5)
Includes
preferred stock purchase rights.
REGISTRATION OF
ADDITIONAL SECURITIES
This Registration
Statement relates to the registration of additional securities under the PACCAR
Inc Savings Investment Plan.  In
accordance with General Instruction E of Form S-8 under the Securities Act, the
contents of the previous Registration Statement on Form S-8 related to the
Savings Investment Plan (Registration No. 333—52230, filed with the Securities
and Exchange Commission on December 20, 2000) are incorporated herein by
reference and made part of this Registration Statement, except as amended
hereby.
The following
documents are filed as exhibits to this Registration Statement:
4.1
PACCAR
Inc Savings Investment Plan (incorporated by reference to Exhibit 10(i) to the
Quarterly Report on Form 10-Q for the period ended September 30, 2005).
4.2
Rights
agreement dated as of December 10, 1998 between PACCAR Inc and First Chicago
Trust Company of New York setting forth the terms of the Series A Junior
Participating Preferred Stock, no par value per share (incorporated by
reference to Exhibit 4.1 of the Current Report on Form 8-K dated December 21,
1998).
4.3
Amendment
Number 1 to rights agreement dated as of December 10, 1998 between PACCAR Inc
and First Chicago Trust Company of New York appointing Wells Fargo Bank N.A. as
successor rights agent, effective as of the close of business September 15,
2000 (incorporated by reference to Exhibit (4)(b) of the Quarterly Report on
Form 10-Q for the period ended September 30, 2000).
23
Consent
of Ernst & Young LLP, Independent Registered Public Accounting Firm.
24
Power
of Attorney.
In lieu of an
Internal Revenue Service ("IRS") determination letter that the Plan is
qualified under Section 401 of the Internal Revenue Code, the undersigned Registrant
hereby undertakes that it will submit the Plan and the amendments thereto to
the IRS in a timely manner and will make all changes required by the IRS to
qualify the Plan.
SIGNATURES
The Registrant
.
Pursuant to the
requirements of the Securities Act of 1933, the Registrant certifies that it
has reasonable grounds to believe that it meets all of the requirements for
filing on Form S-8 in relation to the PACCAR Inc Savings Investment Plan and
has duly caused this registration statement on Form S-8 to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Bellevue,
State of Washington, on this 19th day of December, 2006.
PACCAR Inc
By:
/s/ J. M.
  D'Amato
J. M. D'Amato
Secretary
2
Pursuant to the
requirements of the Securities Act of 1933, this registration statement has
been signed by the following persons in the capacities indicated on December 19,
2006.
Signature
Title
/s/ M. C. Pigott
Chairman and Chief Executive Officer
(principal executive officer)
M. C. Pigott
Director, PACCAR Inc
Vice Chairman
/s/ M. A. Tembreull
(principal financial officer)
M. A. Tembreull
Director, PACCAR Inc
/s/ R. E. Armstrong
Vice President and Controller
R. E. Armstrong
(principal accounting officer)
*
Director, PACCAR Inc
A. J. Carnwath
*
Director, PACCAR Inc
J. M. Fluke, Jr.
*
Director, PACCAR Inc
S. F. Page
*
Director, PACCAR Inc
R. T. Parry
*
Director, PACCAR Inc
J. C. Pigott
*
Director, PACCAR Inc
W. G. Reed, Jr.
*
Director, PACCAR Inc
H. A. Wagner
*
Director, PACCAR Inc
C. R. Williamson
*By:
/s/ M. C. Pigott
M. C. Pigott
Attorney-in-fact
3
The Plan
.
Pursuant to the
requirements of the Securities Act of 1933, the trustees (or other persons who
administer the employee benefit plan) have duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Bellevue, State of Washington, on December 19, 2006.
PACCAR INC SAVINGS INVESTMENT PLAN
By:
/s/ M. C. Pigott
M. C. Pigott
Chairman and Chief Executive Officer
PACCAR Inc
INDEX TO EXHIBITS
Exhibit
Number
Description
4.1
PACCAR Inc Savings Investment Plan (incorporated by
  reference to the Quarterly Report on Form 10-Q for the period ended September
  30, 2005).
4.2
Rights agreement dated as of December 10, 1998
  between PACCAR Inc and First Chicago Trust Company of New York setting forth
  the terms of the Series A Junior Participating Preferred Stock, no par value
  per share (incorporated by reference to Exhibit 4.1 of the Current Report on
  Form 8-K dated December 21, 1998).
4.3
Amendment Number 1 to rights agreement dated as of
  December 10, 1998 between PACCAR Inc and First Chicago Trust Company of New
  York appointing Wells Fargo Bank N.A. as successor rights agent, effective as
  of the close of business September 15, 2000 (incorporated by reference to
  Exhibit (4)(b) of the Quarterly Report on Form 10-Q for the quarter ended
  September 30, 2000).
23
Consent of Ernst & Young LLP, Independent Registered
  Public Accounting Firm.
24
Power of Attorney.
4