W-Body Wiki

The W-platform (also known as the W-body) was a General Motors automobile platform underpinning both mid size and full-size front-wheel drive cars. Originally code named GM10, the program began development in 1982 under Chairman Roger B. Smith and debuted in 1987 with the Pontiac Grand Prix, Buick Regal, and Oldsmobile Cutlass Supreme coupés — with the four-door sedan body style introduced for 1990. Starting with the 2nd Gen 110.5 in wheelbase in 1996 it became a full-size platform as well as a 109 in wheelbase mid-size; from 2005 on the 3rd gen 110.5 in wheelbase full-size was the only version through its discontinuation in 2016.