Authenticity reference

Transmission and axle

date correctness · documented

1970 AMC Rebel Machine in red, white, and blue launch-style appearance; stock-context exterior reference, not individual-car proof. 1970 AMC Rebel Machine

Reference Details

Common issue: Four-speeds, performance gears, and limited-slip carriers are common later upgrades. · 1961 Pontiac Catalina Super Duty 421
Confidence: documented · 1961 Pontiac Catalina Super Duty 421
Correct value: Four-speed, axle ratio, Safe-T-Track status, dates, and installation history agree with the individual conversion · 1961 Pontiac Catalina Super Duty 421
Where to check: Transmission case and tag, shifter, rear-axle carrier and ratio, stampings, invoices, and race records · 1961 Pontiac Catalina Super Duty 421
Common issue: A later four-speed or deeper gear set can be installed without proving the original drivetrain. · 1962 Chevrolet Bel Air Sport Coupe 409
Confidence: documented · 1962 Chevrolet Bel Air Sport Coupe 409
Correct value: Three- or four-speed manual, shifter installation, axle code, ratio, and Positraction status agree with the order and component dates · 1962 Chevrolet Bel Air Sport Coupe 409
Where to check: Transmission case and stamp, shifter and floor, axle tube code, differential, and paperwork · 1962 Chevrolet Bel Air Sport Coupe 409
Common issue: Four-speeds, deep gears, and Positraction are common upgrades. · 1962 Chevrolet Impala Super Sport
Confidence: documented · 1962 Chevrolet Impala Super Sport
Correct value: Transmission type, shifter and console plate, axle code, ratio, and Positraction status match the order · 1962 Chevrolet Impala Super Sport
Where to check: Case and stamp, floor and linkage, console, axle tube, differential, and paperwork · 1962 Chevrolet Impala Super Sport
Common issue: Four-speeds and performance gears are common later upgrades. · 1962 Pontiac Catalina Super Duty 421
Confidence: documented · 1962 Pontiac Catalina Super Duty 421
Correct value: Four-speed case, Hurst linkage, rear carrier, ratio, and Safe-T-Track status agree with the car's record and period use · 1962 Pontiac Catalina Super Duty 421
Where to check: Transmission case and tags, shifter, rear-axle carrier and ratio, stampings, billing history, and race records · 1962 Pontiac Catalina Super Duty 421
Common issue: Four-speeds, aluminum center sections, and performance gears are common later competition upgrades. · 1963 Pontiac Catalina Super Duty 421
Confidence: documented · 1963 Pontiac Catalina Super Duty 421
Correct value: Manual transmission, rear carrier, ratio, and Safe-T-Track status agree with the individual billing and period record · 1963 Pontiac Catalina Super Duty 421
Where to check: Transmission case and tags, linkage, axle housing and carrier, ratio, dates, and PHS documents · 1963 Pontiac Catalina Super Duty 421
Common issue: A desirable four-speed or limited-slip axle installed later is represented as factory equipment. · 1963 Studebaker Avanti
Confidence: documented · 1963 Studebaker Avanti
Correct value: Factory-listed gearbox, controls, axle ratio, and Twin-Traction status agree with the production order · 1963 Studebaker Avanti
Where to check: Production order, transmission identifiers, axle tag and internals, controls, and service history · 1963 Studebaker Avanti
Common issue: An L35 automatic path must not be attributed to L78, and later four-speeds or gear sets do not prove original configuration. · 1965 Chevrolet Impala SS 396
Confidence: documented · 1965 Chevrolet Impala SS 396
Correct value: Transmission type, case, stamp, shifter, axle code, ratio, Positraction status, and component dates agree with the engine order · 1965 Chevrolet Impala SS 396
Where to check: Transmission case, shifter and floor, axle tube stamp, differential, and paperwork · 1965 Chevrolet Impala SS 396
Common issue: Floor controls, later transmission, axle, or Twin-Grip represented as original without body/serial and mechanical reconciliation · 1965 Rambler Marlin
Confidence: documented · 1965 Rambler Marlin
Correct value: Configuration-correct column manual, overdrive, Twin-Stick, column automatic, or Shift-Command controls with torque tube and documented open/Twin-Grip axle · 1965 Rambler Marlin
Where to check: Pedals, shifter and controls, transmission case, overdrive, torque tube, axle, ratio, dates, and records · 1965 Rambler Marlin
Common issue: Four-speed or console conversion, later automatic, open-driveline swap, changed ratio, or added limited slip represented as factory installed · 1966 AMC Marlin
Confidence: documented · 1966 AMC Marlin
Correct value: Documented column three-speed, overdrive, floor four-speed, column automatic, or console automatic with application-correct ratio and optional Twin-Grip · 1966 AMC Marlin
Where to check: Case, pedals, shifter, console, linkage, overdrive, torque tube, axle housing, ratio, dates, and records · 1966 AMC Marlin
Common issue: Later transmissions, gears, and limited-slip carriers are common. · 1966 Buick Riviera Gran Sport
Confidence: documented · 1966 Buick Riviera Gran Sport
Correct value: Super Turbine 400 and 3.42 positive-traction axle agree with component dates and records · 1966 Buick Riviera Gran Sport
Where to check: Transmission, differential, ratio, axle evidence, and paperwork · 1966 Buick Riviera Gran Sport
Common issue: Later four-speeds, TH400s, 12-bolts, and gear sets are common upgrades. · 1966 Chevrolet Impala Super Sport
Confidence: documented · 1966 Chevrolet Impala Super Sport
Correct value: Transmission type, tag or stamp, shifter, axle code, ratio, Positraction status, and dates agree with engine compatibility · 1966 Chevrolet Impala Super Sport
Where to check: Transmission case/tag, floor and shifter, axle tube, differential, and paperwork · 1966 Chevrolet Impala Super Sport
Common issue: Later transmission, console conversion, 1965-66 torque-tube parts, changed ratio, or added limited slip represented as factory installed · 1967 AMC Marlin
Confidence: documented · 1967 AMC Marlin
Correct value: Application-correct manual, overdrive, four-speed, Flash-O-Matic, or Shift-Command path with open driveshaft, four-link rear axle, ratio, and optional Twin-Grip · 1967 AMC Marlin
Where to check: Case, pedals, shifter, console, linkage, overdrive, driveshaft, rear links, axle housing, ratio, dates, and records · 1967 AMC Marlin
Common issue: Automatic/manual swaps or axle-ratio upgrades treated as original without documentation · 1970 AMC Rebel Machine
Confidence: reported · 1970 AMC Rebel Machine
Correct value: Borg-Warner T10 four-speed/Hurst linkage or Shift-Command automatic, with ratio and Twin-Grip evidence matching the claimed configuration · 1970 AMC Rebel Machine
Where to check: Transmission case/tag, shifter, linkage, console, axle tag, differential, build evidence, restoration records · 1970 AMC Rebel Machine
Common issue: Manual swap, changed ratio, Detroit Locker, 31-spline GT-HO driveline, or replacement housing represented as factory · 1970 Ford Falcon GT
Confidence: documented · 1970 Ford Falcon GT
Correct value: Plate-code L manual or B automatic with regular 28-spline 3.25 limited-slip nine-inch rear · 1970 Ford Falcon GT
Where to check: Data plate, transmission, clutch or converter, controls, axle tag, housing, carrier, shafts, ratio, and dates · 1970 Ford Falcon GT
Common issue: Five-speeds, later automatics, gears, and limited-slip carriers are common changes. · 1973 Chevrolet Camaro Z28
Confidence: documented · 1973 Chevrolet Camaro Z28
Correct value: M20, M21, or special TH400 evidence agrees with 3.73 manual or 3.42 automatic Positraction context · 1973 Chevrolet Camaro Z28
Where to check: Transmission stamp or tag, axle code, ratio, castings, dates, and paperwork · 1973 Chevrolet Camaro Z28
Common issue: Automatic-to-manual swaps and later 12-bolt or limited-slip conversions are common possibilities. · 1973 Oldsmobile Cutlass 442 L77 455
Confidence: documented · 1973 Oldsmobile Cutlass 442 L77 455
Correct value: M20 four-speed and 8.5-inch axle codes, dates, and ratio agree with the car's records · 1973 Oldsmobile Cutlass 442 L77 455
Where to check: Transmission stamp, shifter, clutch linkage, axle tube/code, differential, and paperwork · 1973 Oldsmobile Cutlass 442 L77 455
Common issue: Four-speeds, limited-slip carriers, and axle ratios are common later changes. · 1973 Pontiac GTO
Confidence: documented · 1973 Pontiac GTO
Correct value: Manual transmission appears only with the 400; 455 cars use TH400; axle stamp, ratio, and Safe-T-Track evidence agree · 1973 Pontiac GTO
Where to check: PHS record, transmission tag or stamp, axle tube code, differential, ratio, castings, and dates · 1973 Pontiac GTO
Common issue: Later five-speeds, automatics, gears, and limited-slip carriers are common upgrades. · 1974 Chevrolet Camaro Z28
Confidence: documented · 1974 Chevrolet Camaro Z28
Correct value: M20, M21, or special TH400 plus G80 3.73 or C60 3.42 evidence agrees with the build · 1974 Chevrolet Camaro Z28
Where to check: Transmission stamp and tag, axle code, ratio, casting dates, and paperwork · 1974 Chevrolet Camaro Z28
Common issue: Replacement transmissions, axle-ratio changes, and added Dual-Gate shifters are possible. · 1974 Oldsmobile Hurst/Olds W-30 455
Confidence: documented · 1974 Oldsmobile Hurst/Olds W-30 455
Correct value: OX-tag 1974 TH400 with matching VIN and documented 3.23 or 3.42 Anti-Spin axle · 1974 Oldsmobile Hurst/Olds W-30 455
Where to check: Transmission tag and case VIN, axle code and ratio, differential, shifter, and factory records · 1974 Oldsmobile Hurst/Olds W-30 455
Common issue: Later five-speeds, changed gears, and replacement limited-slip units alter the first-year configuration. · 1975 Chevrolet Cosworth Vega
Confidence: documented · 1975 Chevrolet Cosworth Vega
Correct value: M20 four-speed ratios and 3.73 axle evidence agree; G81 requires separate proof · 1975 Chevrolet Cosworth Vega
Where to check: Transmission stamp, shifter and tunnel, axle code, ratio, dates, and paperwork · 1975 Chevrolet Cosworth Vega
Common issue: Manual conversions, replacement automatics, gear changes, and added limited-slip carriers alter the factory combination. · 1975 Chevrolet Monza 2+2
Confidence: documented · 1975 Chevrolet Monza 2+2
Correct value: HM/DB/BX/FU transmission code and HU/HM/HR axle code agree with the documented power team · 1975 Chevrolet Monza 2+2
Where to check: Transmission case or pan, axle tube, ratio check, shifter opening, console, and paperwork · 1975 Chevrolet Monza 2+2
Common issue: Replacement transmissions, changed axle ratios, added limited-slip carriers, and swapped Dual-Gate shifters are possible. · 1975 Oldsmobile Hurst/Olds W-30 455
Confidence: documented · 1975 Oldsmobile Hurst/Olds W-30 455
Correct value: OD-tag 1975 TH400, or OW for California, with matching VIN and a documented 2.56, 2.73, or 3.08 axle · 1975 Oldsmobile Hurst/Olds W-30 455
Where to check: Transmission tag and case VIN, right axle-tube code, carrier, ratio, shifter, and factory records · 1975 Oldsmobile Hurst/Olds W-30 455
Common issue: Swapped four- and five-speeds, cut tunnels, changed gears, and replacement limited-slip carriers alter the configuration. · 1976 Chevrolet Cosworth Vega
Confidence: documented · 1976 Chevrolet Cosworth Vega
Correct value: M20 and 3.73 or M75 T-50 and 4.10 evidence agree; G81 requires separate proof · 1976 Chevrolet Cosworth Vega
Where to check: Transmission tag and stamp, shifter opening, tunnel plate, axle code, ratio, dates, and paperwork · 1976 Chevrolet Cosworth Vega
Common issue: Five-speeds, replacement automatics, changed gears, and aftermarket limited-slip units are common. · 1977 Chevrolet Camaro Z28
Confidence: documented · 1977 Chevrolet Camaro Z28
Correct value: M21 with 3.73 or TH350 with 3.42 evidence agrees; G80 requires separate proof · 1977 Chevrolet Camaro Z28
Where to check: Transmission stamp and tag, axle code, ratio, casting dates, and paperwork · 1977 Chevrolet Camaro Z28