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              UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



         Date of Report (Date of earliest event reported) April 15, 2005


                     NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)


                                    Delaware
                 (State or other jurisdiction of incorporation)



            333-67112-06                               51-0337491
      (Commission File Number)            (I.R.S. Employer Identification No.)




  425 N. Martingale Road Schaumburg, Illinois              60173
   (Address of principal executive offices)             (Zip Code)



         Registrant's telephone number including area code 630-753-4000


--------------------------------------------------------------------------------

                    INFORMATION TO BE INCLUDED IN THE REPORT


Item 8.01.  Other Events.


            On April 15, 2005, the Registrant made available the
            Monthly Servicer Certificate for the Period of March 2005
            for the NAVISTAR FINANCIAL 2004-B OWNER TRUST,  which  is
            attached as Exhibit 20 hereto.


Item 9.01   Financial Statements and Exhibits.


         (c)      See attached Exhibit 20.


--------------------------------------------------------------------------------

                                   SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                      NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)



Date:  April 26, 2005                     By:/s/ PAUL E. MARTIN
-----------------------                          --------------------------
                                                 Paul E. Martin
                                                 Vice President &amp; Controller


--------------------------------------------------------------------------------


                                  EXHIBIT INDEX

Exhibit No.    Description

   20          Navistar Financial 2004-B Owner Trust
               Monthly Servicer Certificate #5, dated April 15, 2005


================================================================================


                                   EXHIBIT 20

                   Navistar Financial 2004 - B Owner Trust
                          For the Month of March 2005
                       Distribution Date of April 15, 2005
                           Servicer Certificate  #5

Original Pool Amount                                                 $398,463,516.43
Subsequent Receivables (transferred 11/17/04)                        $148,829,668.80
Subsequent Receivables (transferred 12/17/04)                        $151,771,733.07
Subsequent Receivables (transferred 01/18/05)                         $50,934,291.61
Beginning Pool Balance                                               $668,210,655.34
Beginning Pool Factor                                                      0.8909485

Principal and Interest Collections:
     Principal Collected (Incl. Servicer Advance Repay)               $17,383,073.03
     Interest Collected                                                $3,986,758.71
     Mandatory Prepayments                                                     $0.00
Additional Deposits:

     Repurchase Amounts                                                        $0.00

     Liquidation Proceeds / Recoveries                                   $182,678.26
Total Additional Deposits                                                $182,678.26

Repos / Chargeoffs                                                       $175,453.84
Aggregate Number of Notes Charged Off                                             29

Total Available Funds                                                 $20,637,526.68

Ending Pool Balance                                                  $651,567,111.79
Ending Pool Factor                                                         0.8687571

Servicing Fee                                                            $556,842.21
     memo: Servicer will allocate $1,500.00 of Servicing
           Fee as Administration Fee
Repayment of Servicer Advances                                           $914,983.32
-------------------------------------------------------------------------------------
Memo Item - Reserve Account:
    Opening Balance                                                   $20,046,319.66

    Invest. Income                                                        $40,326.16
    Excess Service                                                     $1,723,984.90
    Transfer (to)                                                               0.00
                                                                   ------------------
    Collections Acct
    Beginning Balance                                                 $21,810,630.72

-------------------------------------------------------------------------------------
Reserve Account:
     Beginning Balance  (see Memo Item)                               $21,810,630.72
     Target Percentage                                                         3.00%
     Target Balance                                                   $19,547,013.35
     Specified Yield Supplement Amount                                         $0.00
     Specified Yield Supplement Amount                                         $0.00
     Specified Reserve Account Balance                                $19,547,013.35
     Minimum Balance                                                  $14,999,984.20
     (Release) / Deposit                                              ($2,263,617.37)
     Ending Balance                                                   $19,547,013.35

-------------------------------------------------------------------------------------
Current Weighted Average APR:                                                 7.032%
-------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------
Current Weighted Average Remaining Term (months):                              47.79
-------------------------------------------------------------------------------------

Delinquencies                                                                Dollars    Notes
                             Installments: 1 - 30 days                  2,329,742.86    2,309
                                           31 - 60 days                   426,796.38      418
                                           60+  days                       69,628.14       62

                                    Total:                              2,826,167.38    2,324
                                 Balances: 60+  days                    1,622,953.36       62


------------------------------------------------------------------------------------------------------------------------------------


Navistar Financial 2004 - B Owner Trust
For the Month of March 2005
                                                             NOTES                                        CLASS B        CLASS C
                            TOTAL        CLASS A - 1     CLASS A - 2     CLASS A - 3     CLASS A - 4       NOTES          NOTES
                       $750,000,000.00 $113,000,000.00 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Original Pool Amount

Distributions:
      Distribution Percentages  1              100.00%           0.00%           0.00%           0.00%          0.00%          0.00%
      Coupon                                   2.2000%         2.7200%         3.1300%         3.5300%        3.3900%        3.9300%

Beginning Pool Balance $668,210,655.34
Ending Pool Balance    $651,567,111.79

Collected Principal     $16,468,089.71
Collected Interest       $3,986,758.71
Charge - Offs              $175,453.84
Liquidation Proceeds
     / Recoveries          $182,678.26

Servicing &amp; Administration $556,842.21
Investment Earnings
       from Pre-Fund Acct.       $0.00
Cash Transfer from
       Negative Carry Acct.      $0.00
Cash Transfer from
       Pre-Funding Acct.         $0.00
Cash Transfer from Reserve Acct. $0.00
Total Collections Avail
      for Debt Svcs     $20,080,684.47

Beginning Balance      $668,210,655.34  $31,210,655.34 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00

Interest Due 2           $1,713,156.02      $59,126.85     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Interest Paid            $1,713,156.02      $59,126.85     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Principal Due           $16,643,543.55  $16,643,543.55           $0.00           $0.00           $0.00          $0.00          $0.00
Mandatory Prepayments
      Class A-1 only             $0.00           $0.00
Principal Paid          $16,643,543.55  $16,643,543.55           $0.00           $0.00           $0.00          $0.00          $0.00


Ending Balance         $651,567,111.79  $14,567,111.79 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Note / Certificate Pool Factor
   (Ending Balance/Original Pool Amt)        0.1289125       1.0000000       1.0000000       1.0000000      1.0000000      1.0000000

Total Distributions     $18,356,699.57  $16,702,670.40     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25


Interest Shortfall               $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Principal Shortfall              $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
          Total Shortfall        $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Excess Servicing (see Memo Item
          -Reserve Acct  $1,723,984.90

Beginning Reserve
       Acct Balance     $21,810,630.72
(Release)/Draw          ($2,263,617.37)
Ending Reserve
       Acct Balance     $19,547,013.35

1) (a) 100% to the Class A-1 Notes until the Class A-1 Notes are paid in full.  (b) 94.00% of any amount remaining after the
    application of funds in clause (a) to the remaining Class A Notes sequentially until the Class A Notes are paid in full.
   (c) 58.33% of any amount remaining after the application of funds in clauses (a) and  (b) to the Class B Notes until the Class B
    Notes are paid in full.  (d) Any amount remaining after the application of funds in clauses (a), (b) and (c) to the Class C
    Notes until the Class C Notes are paid in full.
2) Class A-1  Interest based on Actual Number of Days.  Interest on other classes based on a 30 day month.  Interest  for first
   settlement based off 28 days, from 11/17/04 to, but excluding, 12/15/04.

(* x represents previously paid interest to other classes.)
(* y represents previously paid interest and principal on other classes.)
========================================================
Memo Item - Advances:
   Servicer Advances - Current Month      ($914,983.32)
   Total Outstanding Servicer Advances   $2,323,184.08
========================================================


------------------------------------------------------------------------------------------------------------------------------------


Navistar Financial 2004 - B Owner Trust
For the Month of March 2005

Trigger EventsA)  Loss Trigger
              B)  Delinquency Trigger
              C)  Noteholders Percent Trigger

                                         5                 4                3              2               1               0
                                       Oct-04            Nov-04          Dec-04          Jan-05         Feb-05           Mar-05

Remaining Gross Balance                 N/A          $441,897,747.66 $590,821,805.36 $740,229,491.93 $778,695,303.30 $757,011,197.42

A)   Loss Trigger:

Principal of Contracts Charged Off      N/A               $42,639.97     $176,479.01     $166,381.74     $190,472.99     $175,453.84

Recoveries                              N/A                    $0.00         $500.84      $17,760.23           $0.00     $182,678.26

Total Charged Off (Months 5, 4, 3)      N\A
Total Recoveries (Months 3, 2, 1)      $18,261.07
                                  -----------------
Net Loss / (Recoveries) for 3 Mos       N\A      (a)

Total Balance (Months 5, 4, 3)  $1,032,719,553.02(b)

Loss Ratio Annualized [(a/b)*(12)]        0.0000%

Trigger:  Is Ratio > 1.5%                   No
                                                                                       Jan-05           Feb-05           Mar-05
B)   Delinquency Trigger:                                                          $1,478,167.43     $2,346,430.92    $1,622,953.36
     Balance delinquency 60+ days                                                        0.19969%         0.30133%         0.21439%
     As % of Beginning Pool Balance                                                      0.19703%         0.26272%         0.23847%
     Three Month Average

     Trigger:  Is Average > 2.0%           No

C)   Noteholders Percent Trigger:        2.6063%
     Ending Reserve Account Balance
     not less than 1% of Initial Aggregate
     Receivables Balance

Trigger:  Is Minimum &lt; 1.0%              No

===================================================================================================================================
</PRE>
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{"company-data": {"conformed-name": "Navistar Financial 2004-B Owner Trust", "cik": "0001308733", "assigned-sic": "6189", "irs-number": "510337491", "fiscal-year-end": "1031"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-67112-06", "film-number": "05773022"}, "business-address": {"street1": "425 N. MARTINGALE ROAD", "street2": "SUITE 1800", "city": "SCHAUMBURG", "state": "IL", "zip": "60173", "phone": "630-753-4000"}, "mail-address": {"street1": "425 N. MARTINGALE ROAD", "street2": "SUITE 1800", "city": "SCHAUMBURG", "state": "IL", "zip": "60173"}}
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported) April 15, 2005

                     NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)

                                    Delaware
                 (State or other jurisdiction of incorporation)

            333-67112-06                               51-0337491
      (Commission File Number)            (I.R.S. Employer Identification No.)

  425 N. Martingale Road Schaumburg, Illinois              60173
   (Address of principal executive offices)             (Zip Code)

         Registrant's telephone number including area code 630-753-4000

--------------------------------------------------------------------------------

                    INFORMATION TO BE INCLUDED IN THE REPORT

Item 8.01.  Other Events.

            On April 15, 2005, the Registrant made available the
            Monthly Servicer Certificate for the Period of March 2005
            for the NAVISTAR FINANCIAL 2004-B OWNER TRUST,  which  is
            attached as Exhibit 20 hereto.

Item 9.01   Financial Statements and Exhibits.

         (c)      See attached Exhibit 20.

--------------------------------------------------------------------------------

                                   SIGNATURE

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                      NAVISTAR FINANCIAL 2004-B OWNER TRUST
             (Exact name of Registrant as specified in its charter)

Date:  April 26, 2005                     By:/s/ PAUL E. MARTIN
-----------------------                          --------------------------
                                                 Paul E. Martin
                                                 Vice President & Controller

--------------------------------------------------------------------------------

                                  EXHIBIT INDEX

Exhibit No.    Description

   20          Navistar Financial 2004-B Owner Trust
               Monthly Servicer Certificate #5, dated April 15, 2005

================================================================================

                                   EXHIBIT 20

                   Navistar Financial 2004 - B Owner Trust
                          For the Month of March 2005
                       Distribution Date of April 15, 2005
                           Servicer Certificate  #5

Original Pool Amount                                                 $398,463,516.43
Subsequent Receivables (transferred 11/17/04)                        $148,829,668.80
Subsequent Receivables (transferred 12/17/04)                        $151,771,733.07
Subsequent Receivables (transferred 01/18/05)                         $50,934,291.61
Beginning Pool Balance                                               $668,210,655.34
Beginning Pool Factor                                                      0.8909485

Principal and Interest Collections:
     Principal Collected (Incl. Servicer Advance Repay)               $17,383,073.03
     Interest Collected                                                $3,986,758.71
     Mandatory Prepayments                                                     $0.00
Additional Deposits:

     Repurchase Amounts                                                        $0.00

     Liquidation Proceeds / Recoveries                                   $182,678.26
Total Additional Deposits                                                $182,678.26

Repos / Chargeoffs                                                       $175,453.84
Aggregate Number of Notes Charged Off                                             29

Total Available Funds                                                 $20,637,526.68

Ending Pool Balance                                                  $651,567,111.79
Ending Pool Factor                                                         0.8687571

Servicing Fee                                                            $556,842.21
     memo: Servicer will allocate $1,500.00 of Servicing
           Fee as Administration Fee
Repayment of Servicer Advances                                           $914,983.32
-------------------------------------------------------------------------------------
Memo Item - Reserve Account:
    Opening Balance                                                   $20,046,319.66

    Invest. Income                                                        $40,326.16
    Excess Service                                                     $1,723,984.90
    Transfer (to)                                                               0.00
                                                                   ------------------
    Collections Acct
    Beginning Balance                                                 $21,810,630.72

-------------------------------------------------------------------------------------
Reserve Account:
     Beginning Balance  (see Memo Item)                               $21,810,630.72
     Target Percentage                                                         3.00%
     Target Balance                                                   $19,547,013.35
     Specified Yield Supplement Amount                                         $0.00
     Specified Yield Supplement Amount                                         $0.00
     Specified Reserve Account Balance                                $19,547,013.35
     Minimum Balance                                                  $14,999,984.20
     (Release) / Deposit                                              ($2,263,617.37)
     Ending Balance                                                   $19,547,013.35

-------------------------------------------------------------------------------------
Current Weighted Average APR:                                                 7.032%
-------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------
Current Weighted Average Remaining Term (months):                              47.79
-------------------------------------------------------------------------------------

Delinquencies                                                                Dollars    Notes
                             Installments: 1 - 30 days                  2,329,742.86    2,309
                                           31 - 60 days                   426,796.38      418
                                           60+  days                       69,628.14       62

                                    Total:                              2,826,167.38    2,324
                                 Balances: 60+  days                    1,622,953.36       62

------------------------------------------------------------------------------------------------------------------------------------

Navistar Financial 2004 - B Owner Trust
For the Month of March 2005
                                                             NOTES                                        CLASS B        CLASS C
                            TOTAL        CLASS A - 1     CLASS A - 2     CLASS A - 3     CLASS A - 4       NOTES          NOTES
                       $750,000,000.00 $113,000,000.00 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Original Pool Amount

Distributions:
      Distribution Percentages  1              100.00%           0.00%           0.00%           0.00%          0.00%          0.00%
      Coupon                                   2.2000%         2.7200%         3.1300%         3.5300%        3.3900%        3.9300%

Beginning Pool Balance $668,210,655.34
Ending Pool Balance    $651,567,111.79

Collected Principal     $16,468,089.71
Collected Interest       $3,986,758.71
Charge - Offs              $175,453.84
Liquidation Proceeds
     / Recoveries          $182,678.26

Servicing & Administration $556,842.21
Investment Earnings
       from Pre-Fund Acct.       $0.00
Cash Transfer from
       Negative Carry Acct.      $0.00
Cash Transfer from
       Pre-Funding Acct.         $0.00
Cash Transfer from Reserve Acct. $0.00
Total Collections Avail
      for Debt Svcs     $20,080,684.47

Beginning Balance      $668,210,655.34  $31,210,655.34 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00

Interest Due 2           $1,713,156.02      $59,126.85     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Interest Paid            $1,713,156.02      $59,126.85     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25
Principal Due           $16,643,543.55  $16,643,543.55           $0.00           $0.00           $0.00          $0.00          $0.00
Mandatory Prepayments
      Class A-1 only             $0.00           $0.00
Principal Paid          $16,643,543.55  $16,643,543.55           $0.00           $0.00           $0.00          $0.00          $0.00

Ending Balance         $651,567,111.79  $14,567,111.79 $240,000,000.00 $183,000,000.00 $169,000,000.00 $26,250,000.00 $18,750,000.00
Note / Certificate Pool Factor
   (Ending Balance/Original Pool Amt)        0.1289125       1.0000000       1.0000000       1.0000000      1.0000000      1.0000000

Total Distributions     $18,356,699.57  $16,702,670.40     $544,000.00     $477,325.00     $497,141.67     $74,156.25     $61,406.25

Interest Shortfall               $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Principal Shortfall              $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
          Total Shortfall        $0.00           $0.00           $0.00           $0.00           $0.00          $0.00          $0.00
Excess Servicing (see Memo Item
          -Reserve Acct  $1,723,984.90

Beginning Reserve
       Acct Balance     $21,810,630.72
(Release)/Draw          ($2,263,617.37)
Ending Reserve
       Acct Balance     $19,547,013.35

1) (a) 100% to the Class A-1 Notes until the Class A-1 Notes are paid in full.  (b) 94.00% of any amount remaining after the
    application of funds in clause (a) to the remaining Class A Notes sequentially until the Class A Notes are paid in full.
   (c) 58.33% of any amount remaining after the application of funds in clauses (a) and  (b) to the Class B Notes until the Class B
    Notes are paid in full.  (d) Any amount remaining after the application of funds in clauses (a), (b) and (c) to the Class C
    Notes until the Class C Notes are paid in full.
2) Class A-1  Interest based on Actual Number of Days.  Interest on other classes based on a 30 day month.  Interest  for first
   settlement based off 28 days, from 11/17/04 to, but excluding, 12/15/04.

(* x represents previously paid interest to other classes.)
(* y represents previously paid interest and principal on other classes.)
========================================================
Memo Item - Advances:
   Servicer Advances - Current Month      ($914,983.32)
   Total Outstanding Servicer Advances   $2,323,184.08
========================================================

------------------------------------------------------------------------------------------------------------------------------------

Navistar Financial 2004 - B Owner Trust
For the Month of March 2005

Trigger EventsA)  Loss Trigger
              B)  Delinquency Trigger
              C)  Noteholders Percent Trigger

                                         5                 4                3              2               1               0
                                       Oct-04            Nov-04          Dec-04          Jan-05         Feb-05           Mar-05

Remaining Gross Balance                 N/A          $441,897,747.66 $590,821,805.36 $740,229,491.93 $778,695,303.30 $757,011,197.42

A)   Loss Trigger:

Principal of Contracts Charged Off      N/A               $42,639.97     $176,479.01     $166,381.74     $190,472.99     $175,453.84

Recoveries                              N/A                    $0.00         $500.84      $17,760.23           $0.00     $182,678.26

Total Charged Off (Months 5, 4, 3)      N\A
Total Recoveries (Months 3, 2, 1)      $18,261.07
                                  -----------------
Net Loss / (Recoveries) for 3 Mos       N\A      (a)

Total Balance (Months 5, 4, 3)  $1,032,719,553.02(b)

Loss Ratio Annualized [(a/b)*(12)]        0.0000%

Trigger:  Is Ratio > 1.5%                   No
                                                                                       Jan-05           Feb-05           Mar-05
B)   Delinquency Trigger:                                                          $1,478,167.43     $2,346,430.92    $1,622,953.36
     Balance delinquency 60+ days                                                        0.19969%         0.30133%         0.21439%
     As % of Beginning Pool Balance                                                      0.19703%         0.26272%         0.23847%
     Three Month Average

     Trigger:  Is Average > 2.0%           No

C)   Noteholders Percent Trigger:        2.6063%
     Ending Reserve Account Balance
     not less than 1% of Initial Aggregate
     Receivables Balance

Trigger:  Is Minimum < 1.0%              No

===================================================================================================================================