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Authenticity reference

Engine, transmission, and axle power team

numbers matching · documented

Reference Details

Common issue
Swapped 454, added four-barrel, converted four-speed, changed axle, deleted emissions equipment, or current performance hardware represented as original delivery · 1974 GMC Sprint
Confidence
documented · 1974 GMC Sprint
Correct value
Application-correct 350, 400, or 454 with its carburetor, emissions equipment, three-speed, automatic, or close-ratio four-speed, controls, 2.73, 3.08, or 3.42 axle, dates, and records · 1974 GMC Sprint
Where to check
Identity and order evidence, engine stamp and castings, carburetor, intake, emissions labels and hardware, gearbox, clutch and pedals, controls, axle housing and carrier, component dates, and invoices · 1974 GMC Sprint
Common issue
Later EFI 5.0 swap, added carburetor or turbo, SVO engine, changed T-5 or AOD, 8.8-inch axle, gears, or badges represented as born-with equipment · 1984 Ford Mustang GT
Confidence
documented · 1984 Ford Mustang GT
Correct value
Record-supported 5.0 four-barrel/T-5/3.08, 5.0 central-fuel-injection/AOD/3.27, or 2.3 Turbo/T-5/3.45 combination with Traction-Lok, emissions equipment, and dates that agree · 1984 Ford Mustang GT
Where to check
VIN engine character, certification and emissions labels, engine identifiers, induction, turbo hardware, transmission tag and case, controls, axle tag and carrier, dates, and Ford records · 1984 Ford Mustang GT

Cars With This Authenticity Marker

2 linked car pages.

Sources & Documentation