The General Motors A platform (commonly called A-body) was a mid-size car automobile platform. General Motors Corporation ( GM) ( is a multinational automobile manufacturer founded in 1908 and headquartered in the United States. A mid-size car (occasionally referred to as an intermediate) is the North American and Australian term for an Automobile with a size between An automobile platform is a shared set of common design engineering and production efforts as well as major components over a number of outwardly distinct models and even types of The A-bodies evolved from rear wheel drive compact cars to front wheel drive mid-size cars over the course of 32 years. The switch in drive layout in 1982 spawned the G-body. See also GM G platform (FWD The General Motors G platform (also called G-body) was used for GM Mid-size cars In the end, every A-body car line was cancelled, but new nameplates on the GM Epsilon platform have taken their place. Epsilon is General Motors ' new mid-size Front-wheel drive Automobile platform.