GM Sigma platform
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|GM Sigma platform|
2010 Cadillac CTS Wagon
|Parent company||General Motors|
|Body and chassis|
|Layout||Longitudinal Front engine, rear-wheel drive / all-wheel drive|
|Related||GM Zeta platform|
|Length||188.5–197.6 in (4,787.9–5,019.0 mm)|
|Width||70.6–74.1 in (1,793.2–1,882.1 mm)|
|Height||55.9–67.8 in (1,419.9–1,722.1 mm)|
|Curb weight||3,568–4,343 lb (1,618–1,970 kg)|
|Predecessor||GM V platform (RWD)|
|Successor||GM Alpha platform|
Sigma was General Motors' mid-size rear-wheel drive automobile platform. The architecture debuted in 2002 with the 2003 Cadillac CTS and is adaptable for all-wheel drive and extended wheelbase versions.
The Sigma platform has a four-wheel independent suspension with control arms in front and multi-link in the rear. GM's High Feature V6 and Northstar V8 are most common, though the small-block V8 has also been used. GM's 5-speed 5L40/5L50 automatic transmission is used throughout the range.
Vehicles based on this platform:
The Sigma II platform debuted with the 2008 Cadillac CTS, and is larger and wider than its predecessor. However, it is more flexible; sharing more parts with the larger Zeta platform than it does with the Sigma I platform. Despite this parts sharing, Sigma II remains exclusive to Cadillac vehicles. For the 2011 model year coupé and station wagon body styles were introduced. Engines for this platform range from the High Feature V6 engine to the supercharged LSA V8 in the Cadillac CTS-V.