GM W platform
|Predecessor||GM G platform (RWD)
GM A platform (FWD)
|Successor||GM Epsilon platform|
|Class||Mid-size (D) platform
Large car (E) platform
|Body style(s)||4-door sedan
Iron Duke I4
High Value V6
High Feature V6
|Transmission(s)||3-speed 3T40 automatic
4-speed 4T60 automatic
4-speed 4T60-HD automatic
4-speed 4T65 automatic
4-speed 4T60-E automatic
4-speed 4T65-E automatic
4-speed 4T65E-HD automatic
5-speed Getrag 282 manual
5-speed Getrag 284 Manual
6-speed 6T70 automatic
|Wheelbase||107.5 in (2730 mm)
109.0 in (2769 mm)
110.5 in (2807 mm)
Chevrolet Impala Limited
Chevrolet Monte Carlo
Oldsmobile Cutlass Supreme
Pontiac Grand Prix
The W-body is an automobile platform from General Motors which underpins mid-size cars with front-wheel drive. The platform, originally code named GM10, began in 1982 under Chairman Roger B. Smith and debuted in 1988 with the Pontiac Grand Prix, the Buick Regal, and the Oldsmobile Cutlass Supreme coupés. Sedans followed for 1990.
The platform cost $7 billion to develop and was to replace all midsize cars produced by Chevrolet, Pontiac, Oldsmobile, and Buick. The plan was huge in scope, calling for seven plants that would each assemble 250,000 of the cars, or 21% of the total U.S. car market. It was badly executed from the start, but GM’s 1984 reorganization, combined with changing market dynamics wrought havoc on the program and it never recovered. By 1989, the year before the last of the original GM10's were launched, GM was losing $2000 on every one of the cars it produced.
The later revision of this platform was known as the MS2000 or simply the W2-Car. Early versions used a fiberglass monoleaf spring combined with struts in the rear. The "generation 1.5" W-body models had updated rear suspensions that used coil springs instead of the leaf spring design. For the 1997 model year the second generation W-body was released with a MacPherson strut coil spring design.
The W platform was updated in 2004 rather than being replaced by a stretched Epsilon platform, as had been planned. Metal fabrication of the floor pan for W-body cars is performed at the Parma Metal Center in Parma, Ohio. The cars are built at GM's Oshawa Car Assembly. The transverse use of GM's small-block engine in the W-bodies was a major addition for 2005.
The GM W-body platform is in the process of being phased out. The only car remaining on the platform is the Chevrolet Impala, which is being replaced by a new model on the GM Epsilon platform beginning in MY 2014. However, GM has announced that the W-Body Impala will also remain in production through CY June 2014. 
Vehicles using the W-body include:
- 1st Gen 107.5 in wheelbase
- 1.5 Gen 107.5 in wheelbase
- 2nd Gen 109 in wheelbase
- 2nd Gen 110.5 in wheelbase
- 3rd gen 110.5 in wheelbase
- Alex Taylor III, Andrew Erdman, Justin Martin, and Tricia Welsh, "U.S. Cars Come Back", Fortune, November 16, 1992
- Robert A.G. Monks, "GM Corporate Governance Case Study"
- "Current-Generation Chevrolet Impala Gets A New Lease On Life".
- "Outgoing Chevy Impala lives another year, as fleet-only model". autonews.com. Retrieved March 13, 2013.
- "Outgoing Impala to Continue as 2014 Chevrolet Impala Limited for Fleets". Motor Trend. Retrieved March 13, 2013.
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