GM Sigma platform
|This article does not cite any references or sources. (July 2009)|
Sigma is 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:
Sigma II, larger and wider than its previous counterpart, debuted with the 2008 CTS, and shares more parts with the larger Zeta than the smaller Sigma I. Sigma II is more flexible and features the Direct Injection 3.6 HF V6 as its primary engine and a new more powerful 3.6 L DI HF V6, as well as supercharged smallblock V8 for the Cadillac CTS-V. Sigma will stay a Cadillac exclusive. Coupe and wagon versions arrived for the 2011 model year. Vehicles using this platform: