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>
            <cik>0001918190</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001411207</issuerCik>
        <issuerName>Allison Transmission Holdings Inc</issuerName>
        <secFileNumber>001-35456</secFileNumber>
        <issuerAddress>
          <com:street1>ONE ALLISON WAY</com:street1>
          <com:city>Indianapolis</com:city>
          <com:stateOrCountry>IN</com:stateOrCountry>
          <com:zipCode>46222</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(317) 242-5000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>van Niekerk Teresa</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>225 Liberty St</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10281</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>6241</noOfUnitsSold>
        <aggregateMarketValue>467275.27</aggregateMarketValue>
        <noOfUnitsOutstanding>87214197</noOfUnitsOutstanding>
        <approxSaleDate>02/26/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/26/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Exercise of employee stock options</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Allison Transmission Holdings Inc</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>6241</amountOfSecuritiesAcquired>
        <paymentDate>02/26/2024</paymentDate>
        <natureOfPayment>Broker assisted cashless exercise</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>02/26/2024</noticeDate>
        <signature>Teresa van Niekerk</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001918190
  XXXXXXXX
  LIVE
  0001411207
  Allison Transmission Holdings Inc
  001-35456
  ONE ALLISON WAY
  Indianapolis
  IN
  46222
  (317) 242-5000
  van Niekerk Teresa
  Officer
  Common Stock
  Merrill Lynch
  225 Liberty St
  New York
  NY
  10281
  6241
  467275.27
  87214197
  02/26/2024
  NYSE
  Common Stock
  02/26/2024
  Exercise of employee stock options
  Allison Transmission Holdings Inc
  N
  6241
  02/26/2024
  Broker assisted cashless exercise
  Y
  02/26/2024
  Teresa van Niekerk