content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <!-- Field: Pseudo-Tag; ID: Name; Data: Stockbridge Partners LLC -->
            <cik>0001505183</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001260221</issuerCik>
        <issuerName>TransDigm Group INC</issuerName>
        <secFileNumber>001-32833</secFileNumber>
        <issuerAddress>
          <com:street1>1350 Euclid Avenue, Suite 1600</com:street1>
          <com:city>Cleveland</com:city>
          <com:stateOrCountry>OH</com:stateOrCountry>
          <com:zipCode>44115</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>216-706-2960</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Stockbridge Partners LLC</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>May be deemed affiliate</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Goldman, Sachs &amp; Co.,</name>
          <address>
            <com:street1>200 West Street</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10282-2198</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>65000</noOfUnitsSold>
        <aggregateMarketValue>95280250.00</aggregateMarketValue>
        <noOfUnitsOutstanding>56167085</noOfUnitsOutstanding>
        <approxSaleDate>06/10/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated</name>
          <address>
            <com:street1>4 World Center</com:street1>
            <com:street2>250 Vesey Street</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10080</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>65000</noOfUnitsSold>
        <aggregateMarketValue>95280250.00</aggregateMarketValue>
        <noOfUnitsOutstanding>56167085</noOfUnitsOutstanding>
        <approxSaleDate>06/10/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Morgan Stanley &amp; Co. LLC</name>
          <address>
            <com:street1>1585 Broadway</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10036</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>65000</noOfUnitsSold>
        <aggregateMarketValue>95280250.00</aggregateMarketValue>
        <noOfUnitsOutstanding>56167085</noOfUnitsOutstanding>
        <approxSaleDate>06/10/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>12/06/2010</acquiredDate>
        <natureOfAcquisitionTransaction>Open market purchases</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open market purchases</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>65000</amountOfSecuritiesAcquired>
        <paymentDate>12/06/2010</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Stockbridge Partners LLC</name>
          <address>
            <com:street1>200 Clarendon Street 35th Floor</com:street1>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02116</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>03/13/2025</saleDate>
        <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
        <grossProceeds>1335218.90</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Stockbridge Partners LLC</name>
          <address>
            <com:street1>200 Clarendon Street 35th Floor</com:street1>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02116</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>03/14/2025</saleDate>
        <amountOfSecuritiesSold>9034</amountOfSecuritiesSold>
        <grossProceeds>12115718.73</grossProceeds>
      </securitiesSoldInPast3Months>
      <remarks>Stockbridge Partners LLC is deemed to be the beneficial owner of the Common Stock held through a separate managed account and through Stockbridge Fund, L.P. Regarding the "Securities To Be Sold" Table, the dates of acquisition and payment of the Common Stock varied, commencing on the date reported in the Table. Stockbridge Partners LLC is signing this form on behalf of the separate managed account and Stockbridge Fund, L.P.</remarks>
      <noticeSignature>
        <noticeDate>06/10/2025</noticeDate>
        <signature>STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, itsGeneral Partner, Kenneth S. Bring, its M.D.</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6220}]
text: 144
  0001505183
  XXXXXXXX
  LIVE
  0001260221
  TransDigm Group INC
  001-32833
  1350 Euclid Avenue, Suite 1600
  Cleveland
  OH
  44115
  216-706-2960
  Stockbridge Partners LLC
  May be deemed affiliate
  Common Stock
  Goldman, Sachs & Co.,
  200 West Street
  New York
  NY
  10282-2198
  65000
  95280250.00
  56167085
  06/10/2025
  NYSE
  Common Stock
  Merrill Lynch, Pierce, Fenner & Smith Incorporated
  4 World Center
  250 Vesey Street
  New York
  NY
  10080
  65000
  95280250.00
  56167085
  06/10/2025
  NYSE
  Common Stock
  Morgan Stanley & Co. LLC
  1585 Broadway
  New York
  NY
  10036
  65000
  95280250.00
  56167085
  06/10/2025
  NYSE
  Common Stock
  12/06/2010
  Open market purchases
  Open market purchases
  N
  65000
  12/06/2010
  Cash
  N
  Stockbridge Partners LLC
  200 Clarendon Street 35th Floor
  Boston
  MA
  02116
  Common Stock
  03/13/2025
  1000
  1335218.90
  Stockbridge Partners LLC
  200 Clarendon Street 35th Floor
  Boston
  MA
  02116
  Common Stock
  03/14/2025
  9034
  12115718.73
  Stockbridge Partners LLC is deemed to be the beneficial owner of the Common Stock held through a separate managed account and through Stockbridge Fund, L.P. Regarding the "Securities To Be Sold" Table, the dates of acquisition and payment of the Common Stock varied, commencing on the date reported in the Table. Stockbridge Partners LLC is signing this form on behalf of the separate managed account and Stockbridge Fund, L.P.
  06/10/2025
  STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, itsGeneral Partner, Kenneth S. Bring, its M.D.