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>1301 East 9th Street, Suite 3000</com:street1>
          <com:city>Cleveland</com:city>
          <com:stateOrCountry>OH</com:stateOrCountry>
          <com:zipCode>44114</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>133465000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>55958480</noOfUnitsOutstanding>
        <approxSaleDate>06/07/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <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>100000</noOfUnitsSold>
        <aggregateMarketValue>133465000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>55958480</noOfUnitsOutstanding>
        <approxSaleDate>06/07/2024</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>100000</noOfUnitsSold>
        <aggregateMarketValue>133465000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>55958480</noOfUnitsOutstanding>
        <approxSaleDate>06/07/2024</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>100000</noOfUnitsSold>
        <aggregateMarketValue>133465000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>55958480</noOfUnitsOutstanding>
        <approxSaleDate>06/07/2024</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>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <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. StockbridgePartners LLC is signing this form on behalf of the separate managed account and Stockbridge Fund, L.P. The 100,000 shares being sold will be allocated between one or more of the brokers listed above.</remarks>
      <noticeSignature>
        <noticeDate>06/07/2024</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": 5844}]
text: 144
  0001505183
  XXXXXXXX
  LIVE
  0001260221
  TransDigm Group INC
  001-32833
  1301 East 9th Street, Suite 3000
  Cleveland
  OH
  44114
  216-706-2960
  Stockbridge Partners LLC
  May be deemed affiliate.
  Common Stock
  Glen Eagle Wealth, LLC
  4428-C Route 27
  Kingston
  NJ
  08528
  100000
  133465000.00
  55958480
  06/07/2024
  NYSE
  Common Stock
  Goldman, Sachs & Co.
  200 West Street
  New York
  NY
  10282-2198
  100000
  133465000.00
  55958480
  06/07/2024
  NYSE
  Common Stock
  Merrill Lynch, Pierce, Fenner & Smith Incorporated
  4 World Center
  250 Vesey Street
  New York
  NY
  10080
  100000
  133465000.00
  55958480
  06/07/2024
  NYSE
  Common Stock
  Morgan Stanley & Co. LLC
  1585 Broadway
  New York
  NY
  10036
  100000
  133465000.00
  55958480
  06/07/2024
  NYSE
  Common Stock
  04/25/2007
  Open market purchases
  Open market purchases
  N
  100000
  04/25/2007
  Cash
  Y
  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. StockbridgePartners LLC is signing this form on behalf of the separate managed account and Stockbridge Fund, L.P. The 100,000 shares being sold will be allocated between one or more of the brokers listed above.
  06/07/2024
  STOCKBRIDGE PARTNERS LLC, By: BPSP, L.P., its Managing Member, By: Berkshire Partners Holdings LLC, its General Partner, Kenneth S. Bring, its M.D.