5 Things To Think About Before You Buy A General Motors’ G Body

5 Things To Think About Before You Buy A General Motors’ G Body. If you’re in the market for a classic car, you may have your eye on a General Motors’ G body. These cars were produced from 1978 to 1988 and include models such as the Chevrolet Monte Carlo, Oldsmobile Cutlass Supreme, and Buick Regal.