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</com:street1>
          <com:street2>Suite 1600</com:street2>
          <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>Glen Eagle Wealth, LLC</name>
          <address>
            <com:street1>4428-C Route 27</com:street1>
            <com:city>Kingston</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>08528</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>100000</noOfUnitsSold>
        <aggregateMarketValue>137502000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>56084587</noOfUnitsOutstanding>
        <approxSaleDate>03/06/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>04/25/2007</acquiredDate>
        <natureOfAcquisitionTransaction>Open market purchases</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Open market purchases</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>100000</amountOfSecuritiesAcquired>
        <paymentDate>04/25/2007</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>12/12/2024</saleDate>
        <amountOfSecuritiesSold>38053</amountOfSecuritiesSold>
        <grossProceeds>47519855.78</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Robert J. Small</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>02/14/2025</saleDate>
        <amountOfSecuritiesSold>3650</amountOfSecuritiesSold>
        <grossProceeds>4826007.74</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>03/06/2025</noticeDate>
        <signature>STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, its General Partner, Kenneth S. Bring, its M.D.</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4678}]
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
  Glen Eagle Wealth, LLC
  4428-C Route 27
  Kingston
  NJ
  08528
  100000
  137502000.00
  56084587
  03/06/2025
  NYSE
  Common Stock
  04/25/2007
  Open market purchases
  Open market purchases
  N
  100000
  04/25/2007
  Cash
  N
  Stockbridge Partners LLC
  200 CLARENDON STREET, 35TH FLOOR
  BOSTON
  MA
  02116
  Common Stock
  12/12/2024
  38053
  47519855.78
  Robert J. Small
  200 CLARENDON STREET, 35TH FLOOR
  BOSTON
  MA
  02116
  Common Stock
  02/14/2025
  3650
  4826007.74
  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.
  03/06/2025
  STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, its General Partner, Kenneth S. Bring, its M.D.