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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2020-02-26T15:12:53.2866518+00:00 -->
<!-- Version            : 5.0.1.321 -->
<!-- Package ID         : 7a59ede5d5ac4c7cabadf0b66c63b3cb -->
<!-- Copyright (c) 2020 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="alsn_NumberOfAcquisitionsCompleted" name="NumberOfAcquisitionsCompleted" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_GoodwillAndIntangibleAssetsDisclosureLineItems" name="GoodwillAndIntangibleAssetsDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ScheduleOfAcquiredFiniteAndIndefiniteLivedIntangibleAssetByMajorClassTable" name="ScheduleOfAcquiredFiniteAndIndefiniteLivedIntangibleAssetByMajorClassTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_IndefiniteLivedInProcessResearchAndDevelopmentMember" name="IndefiniteLivedInProcessResearchAndDevelopmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_CustomerRelationshipsCommercialMember" name="CustomerRelationshipsCommercialMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ProprietaryTechnologyMember" name="ProprietaryTechnologyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_CustomerRelationshipsDefenseMember" name="CustomerRelationshipsDefenseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_SeniorSecuredCreditFacilityTermBThreeLoanVariableDueTwoThousandTwentyTwoMember" name="SeniorSecuredCreditFacilityTermBThreeLoanVariableDueTwoThousandTwentyTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_FivePercentageSeniorNotesDue2024Member" name="FivePercentageSeniorNotesDue2024Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_SeniorSecuredCreditFacilityTermLoanVariableDue2026Member" name="SeniorSecuredCreditFacilityTermLoanVariableDue2026Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_FourPointSevenFivePercentageSeniorNotesDue2027Member" name="FourPointSevenFivePercentageSeniorNotesDue2027Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_FivePointEightSevenFivePercentageSeniorNotesDue2029Member" name="FivePointEightSevenFivePercentageSeniorNotesDue2029Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_DebtInstrumentMaturityYear" name="DebtInstrumentMaturityYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_DebtInstrumentMaturityMonthAndYear" name="DebtInstrumentMaturityMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_NewRevolvingCreditFacilityMember" name="NewRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_PriorTermLoanMember" name="PriorTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_PriorRevolvingCreditFacilityMember" name="PriorRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_NewSeniorSecuredCreditFacilityMember" name="NewSeniorSecuredCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_PriorSeniorSecuredCreditFacilityMember" name="PriorSeniorSecuredCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_NewTermLoanMember" name="NewTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VariableRateComponentAxis" name="VariableRateComponentAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VariableRateComponentDomain" name="VariableRateComponentDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VariableRateOneMember" name="VariableRateOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VariableRateTwoMember" name="VariableRateTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VariableRateThreeMember" name="VariableRateThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_DebtInstrumentExtendedMaturityYear" name="DebtInstrumentExtendedMaturityYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_DebtIssuanceExpense" name="DebtIssuanceExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_DebtInstrumentFloorRate" name="DebtInstrumentFloorRate" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_DebtInstrumentCovenantNetLeverageRatio" name="DebtInstrumentCovenantNetLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="alsn_DebtInstrumentCovenantLeverageRatioMaximum" name="DebtInstrumentCovenantLeverageRatioMaximum" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="alsn_DebtInstrumentCovenantLeverageRatioAchieved" name="DebtInstrumentCovenantLeverageRatioAchieved" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="alsn_FivePercentageSeniorNotesDueTwentyTwentyFourMember" name="FivePercentageSeniorNotesDueTwentyTwentyFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemable" name="DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemable" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_FourPointSevenFivePercentageSeniorNotesDueTwentyTwentySevenMember" name="FourPointSevenFivePercentageSeniorNotesDueTwentyTwentySevenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_InterestRateSwapsAMember" name="InterestRateSwapsAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_InterestRateSwapsBMember" name="InterestRateSwapsBMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_InterestRateSwapCMember" name="InterestRateSwapCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_AccumulatedOtherComprehensiveIncomeDerivativesQualifyingAsHedgesMember" name="AccumulatedOtherComprehensiveIncomeDerivativesQualifyingAsHedgesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ExtendedTransmissionCoverageMember" name="ExtendedTransmissionCoverageMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ContractWithCustomerLiabilityIncrease" name="ContractWithCustomerLiabilityIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_ChangeInContractWithCustomerLiabilityLineItems" name="ChangeInContractWithCustomerLiabilityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ChangeInContractWithCustomerLiabilityTable" name="ChangeInContractWithCustomerLiabilityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_OtherIncomeExpensePostRetirementBenefitPlanAmendmentCredits" name="OtherIncomeExpensePostRetirementBenefitPlanAmendmentCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_OtherIncomeExpenseNetVendorSettlement" name="OtherIncomeExpenseNetVendorSettlement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_SalesAllowances" name="SalesAllowances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_VendorBuybackObligation" name="VendorBuybackObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_VendorLiabilityCurrent" name="VendorLiabilityCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_NonTradePayableCurrent" name="NonTradePayableCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_DefensePriceReductionReserve" name="DefensePriceReductionReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_DefinedBenefitPlanServicePeriod" name="DefinedBenefitPlanServicePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_HourlyDefinedBenefitPensionPlanMember" name="HourlyDefinedBenefitPensionPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_RetirementSavingsPlansMember" name="RetirementSavingsPlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_FuturePostRetirementMedicalCareAndPrescriptionDrugCostsMember" name="FuturePostRetirementMedicalCareAndPrescriptionDrugCostsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ExciseTaxImposedOnPlans" name="ExciseTaxImposedOnPlans" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_EstimatedImpactOfExciseTaxOnPostretirementBenefitObligation" name="EstimatedImpactOfExciseTaxOnPostretirementBenefitObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_SalariedDefinedBenefitPlanMember" name="SalariedDefinedBenefitPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_DeferredIncomeTaxLiabilitiesRepatriationOfForeignEarnings" name="DeferredIncomeTaxLiabilitiesRepatriationOfForeignEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_TaxCutsAndJobsActIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_TaxCutsAndJobsActChangeinTaxRateIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActChangeinTaxRateIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_TaxCutsandJobsActDecreaseinDeferredTaxLiabilityduetoTransitionTax" name="TaxCutsandJobsActDecreaseinDeferredTaxLiabilityduetoTransitionTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits" name="DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_PercentageOfTaxBenefitRealizedUponSettlement" name="PercentageOfTaxBenefitRealizedUponSettlement" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_TaxCutsAndJobsActOf2017ReclassificationAdjustmentOfStrandedTaxEffectsFromAOCIAttributableToParent" name="TaxCutsAndJobsActOf2017ReclassificationAdjustmentOfStrandedTaxEffectsFromAOCIAttributableToParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_UncategorizedAbstract" name="UncategorizedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_AccrualForEnvironmentalLossContingenciesUndiscountedEstimatedPeriod" name="AccrualForEnvironmentalLossContingenciesUndiscountedEstimatedPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="alsn_NumberOfSignificantCustomers" name="NumberOfSignificantCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="alsn_DaimlerAgMember" name="DaimlerAgMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_PACCARIncMember" name="PACCARIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_NavistarInternationalCorporationMember" name="NavistarInternationalCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VolvoGroupOneMember" name="VolvoGroupOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_TwoThousandSixteenRepurchasePlanMember" name="TwoThousandSixteenRepurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_ValueactCapitalMasterFundLpMember" name="ValueactCapitalMasterFundLpMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_StockRepurchaseProgramIncreaseInAuthorizedAmount" name="StockRepurchaseProgramIncreaseInAuthorizedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="alsn_CommonStockDisclosureLineItems" name="CommonStockDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_CommonStockDisclosureTable" name="CommonStockDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_OtherCountriesMember" name="OtherCountriesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_WalkerDieCastingMember" name="WalkerDieCastingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_AxleTechElectricVehicleSystemsDivisionMember" name="AxleTechElectricVehicleSystemsDivisionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_VantagePowerLimitedMember" name="VantagePowerLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="alsn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNetAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNetAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="alsn_BusinessCombinationContingentConsiderationArrangementsTerm" name="BusinessCombinationContingentConsiderationArrangementsTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</xsd:schema>
