From at least 1936 through 1958, GM used at least four different designations for various bodyshells/platforms including the A-body for Chevrolet, most Pontiacs, and the Oldsmobile Series F and Series 60.
For the 1959 model year, the previous A and B bodies were built on the new B Body that lasted until 1996.
The A-body designation would be resurrected by GM in 1964 for a new series of intermediate-sized cars including the Chevrolet Chevelle, Pontiac Tempest, Oldsmobile Cutlass and Buick Skylark. These later A-bodies underwent a switch in drive layout from rear wheel drive to front wheel drive in 1982. The switch in drive layout spawned the G-body. In 1997, every A-body car line was cancelled, but new nameplates on the GM W platform have taken their place.