i have a 1978 olds cutlass supreme. does any one know if it is an (A body)
or a (G body)? the motor is a 305 with a 4 speed manual trans. 2 door hard top. fastback or notch back?

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GM made mid size RWD cars from 1961?1981 on the A body platform. They also made the FWD Ciera, Century, 6000, Celebrity from 1982?1996 on the A platform.

From 1982?1988 the mid-sized cars were made on the G platform.

Therefore your 1978 Olds Cutlass Supreme is an A body.

cutlass, cutlass supreme, 442 are "A body's"

i was thinking it was a G body..... but after reading online it all became fuzzy.
i was under the impression that they did both that year. i haven't found to much info on the 4 speed with the 305 chevy motor in a cutlass. i think it might be a rare bird. thanks for the information guys.
mike

1978
The 1978 Cutlass moved to a new version of the A-body with a shorter wheelbase. A mild restyle came in 1981. This Cutlass was lighter than earlier versions at around 3300 lb (1500 kg). The A-body version offered enough engine compartment room for larger engine swaps quite easily. 455s from earlier years will fit with minimal modifications and if the car was originally a 260, the engine mounts will line up when swapping a 455. Some A-body Cutlasses were powered with a Chevrolet 305 (5.0 L) to which the popular 350 Chevrolet and big-block 454 Chevrolet also fit easily.

The model lineup included the Cutlass Salon (with an aero-styled body) as the base Cutlass replacing the "S", the formal Cutlass Supreme and Calais coupes, and the Cutlass Cruiser station wagon (formerly the Vista Cruiser). With the Supreme and Calais coupes - a factory T-top coupe was optioned which includes a floor shifter and rally gauges (for the Calais coupe). A 442 decal package was part of the Cutlass Salon aerocoupe.

A 1978-80 Cutlass Salon 4-door sedan was seen in the film Repo Man - in the film, the car (white with tan interior) switches to a 1982 Cutlass Supreme coupe (white with red interior).