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Toploaders Decoded
June 10, 2025
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Toploaders Decoded

The Top Loader Decoder helps you identify details about your Ford 4-speed Top Loader transmission, including gear ratios, production codes, and original applications. This tool is useful for verifying parts during restoration or just learning more about your classic Mustang’s drivetrain. It works with most factory-installed Top Loaders from the 1960s and 1970s.
Tag#YearVehicleEngineRatioComments
HEH A1964Mustang260wide25 spline
HEH B1964Meteor, Fairlane289 2Vwide28 spline
HEH C1964Mustang289wide25 spline
HEH D1964Galaxie390close28 spline
HEH E1964Meteor, Fairlane, Sunbeam Tiger289 4Vclose25 1/2" trans, 28 spline
HEH G1964Mustang260, 289wide25 spline
HEH H1964Galaxie427close28 spline
HEH J1965Galaxie390close28 spline
HEH L1964Fairlane289wide25 1/2" trans, 28 spline
HEH M1964Falcon289 2Vwide25 spline
HEH N1965Fairlane289close25 1/2" trans, 28 spline
HEH P1964Mustang289wide25 spline, 8/20/64 to 12/30/64
HEH R1965Galaxie427close28 spline
HEH S1964Mustang289closeBefore 8/20/64
HEH T1964Mustang289closeFrom 8/20/64 to 10/1/64
HEH AM1966Galaxie427close31 spline
HEH AR1966Fairlane390wide28 spline
HEH BL1965Galaxie390close28 spline
HEH BN1965Fairlane289wideAfter 12/1/64
HEH BP1964Falcon289wideFrom 10/1/64 to 2/1/65
HEH BR1965Mustang260, 289wideFrom 12/30/64 to 2/1/65
HEH BS1965Falcon289wideFrom 2/1/65
HEH BT1965Mustang289closeFrom 2/1/65
HEH BV1966Fairlane, Falcon289wide28 spline
HEH BW1966Mustang289wide28 spline
HEH BX1965Mustang289, 289KcloseFrom 10/1/64
HEH CF1965TVR, Griffit289wide25 1/2" trans
HEH CB1965Galaxie427close28 spline
HEH BY1965AC Cobra427close28 spline
HEH CC1965/66Galaxie390wide28 spline
HEH CG1966Galaxie428close31 spline
HEH CJ1967Fairlane427close31 spline
HEH CL1966Fairlane390 GTwide28 spline
RUG A1967Mustang390wide28 spline
RUG A11967Galaxie390wide28 spline
RUG AD1968Mustang390close28 spline
RUG AD11969Mustang390close28 spline
RUG AE1968Mustang428close31 spline
RUG AE11968 69Mustang, Cougar428close31 spline
RUG AE21969Mustang428, 429close31 spline
RUG AG1969Mustang302, 351close28 spline
RUG AH1969Fairlane351close28 spline
RUG AJ1969Fairlane428close31 spline
RUG AK1969Fairlane351close31 spline
RUG AL1969Fairlane390close28 spline
RUG AR1970Fairlane351both28 spline
RUG AR11970Fairlane351wide28 spline
RUG AS1970Fairlane351close31 spline
RUG AS11970Fairlane351close28 spline
RUG AT1970Fairlane351close28 spline
RUG AT11970Fairlane351close28 spline
RUG AU1970Fairlane429close31 spline
RUG AU11970Torino429close31 spline
RUG AU11971Torino429close31 spline
RUG AV1970Mustang302, 351wide28 spline
RUG AV11970/71Mustang302 4V, 351 4Vwide28 spline
RUG AW1970Mustang302, 351close28 spline
RUG AW11970/71Mustang302 4V, 351 4Vclose28 spline
RUG AZ1970Mustang428 CJ, Boss 429close31 spline
RUG AZ11970Mustang429 4Vclose31 spline
RUG AZ11971Mustang429 CJclose31 spline
RUG B1967Galaxie427close31 spline
RUG B11967Galaxie427close31 spline
RUG B21967Galaxie427close31 spline
RUG BA1970Fairlane351wide28 spline
RUG BA11970/71Fairlane351 4Vwide31 spline
RUG BF1972Fairlane351wide28 spline
RUG BF11972Fairlane351wideAfter 12/1/71
RUG BG1972Fairlane351wide31 spline
RUG BG11972Torino351wide31 spline
RUG BJ1971Mustang351 CJ, Boss 351wideBefore 12/1/71
RUG BJ11972Mustang351 CJ, Boss 351wideAfter 12/1/71
RUG C1967Fairlane390close28 spline
RUG C11967Fairlane390close28 spline
RUG C21967/69Montego, Fairlane, Ranchero390close28 spline
RUG D1967Fairlane, Comet289wide28 spline
RUG D11967Fairlane, Comet289wide28 spline
RUG D21968Fairlane, Falcon289, 302wide28 spline
RUG E1967Mustang289wide28 spline
RUG E11967Mustang289wide28 spline
RUG E21968Mustang, Cougar289wide28 spline
RUG E31969Mustang, Cougar302, 351wide28 spline
RUG G1967Galaxie428close31 spline
RUG G11967Galaxie428close31 spline
RUG G21967Galaxie428close31 spline
RUG J1967Comet, Fairlane390wide28 spline
RUG J11967Fairlane390wide28 spline
RUG J21967Fairlane390wide28 spline
RUG L1967Comet, Fairlane427close31 spline
RUG M1967Mustang390wide28 spline
RUG M11967Mustang390wide28 spline
RUG M21967Mustang390wide28 spline
RUG M21968Mustang390 GTwide28 spline
RUG M31969Mustang390wide28 spline
RUG N1967Mustang289close28 spline
RUG N11967Mustang289close28 spline
RUG N21967Mustang289close28 spline
RUG S1968Mustang428close31 spline
RUG T1968Galaxie390wide28 spline
RUG V1968Galaxie428close31 spline
RUG V11969Galaxie429close31 spline
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