General Motors Sigma platform

Main article: List of GM platforms

GM Sigma platform
2010 Cadillac CTS Wagon
Overview
Manufacturer	Cadillac
Parent company	General Motors
Production	2002-2015
Assembly	China: Shanghai (Shanghai GM) Russia: Kaliningrad, Kaliningrad Oblast (Avtotor) United States: Lansing, Michigan (Lansing Grand River)
Body and chassis
Class	Mid-size (E)
Layout	Longitudinal Front engine, rear-wheel drive / all-wheel drive
Body style(s)	2-door coupé 4-door sedan 5-door station wagon 5-door sport utility vehicle
Vehicles	Cadillac CTS Cadillac SRX Cadillac STS
Related	GM Zeta platform
Powertrain
Engine(s)	2.6 L LY9 V6 (gasoline) 2.8 L LP1 V6 (gasoline) 3.0 L LF1 V6 (gasoline) 3.0 L LFW V6 (gasoline) 3.2 L LA3 V6 (gasoline) 3.6 L LY7 V6 (gasoline) 3.6 L LLT V6 (gasoline) 3.6 L LFX V6 (gasoline) 4.4 L LC3 V8 (supercharged gasoline) 4.6 L LH2 V8 (gasoline) 5.7 L LS6 V8 (gasoline) 6.0 L LS2 V8 (gasoline) 6.2 L LSA V8 (supercharged gasoline)
Transmission(s)	5-speed Getrag 260 manual 5-speed GM 5L40-E automatic 5-speed GM 5L50 automatic 6-speed Aisin AY-6 manual 6-speed GM 6L50 automatic 6-speed GM 6L80 automatic 6-speed GM 6L90 automatic 6-speed Tremec T-56 manual 6-speed Tremec TR-6060 manual
Dimensions
Wheelbase	113.4 in (2,880.4 mm) 116.4 in (2,956.6 mm)
Length	188.5–197.6 in (4,787.9–5,019.0 mm)
Width	70.6–74.1 inches (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)
Chronology
Predecessor	GM V platform (RWD)
Successor	GM Alpha platform

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 long-wheelbase Cadillac STS replaced the front-wheel drive GM G platform Cadillac Seville. The CTS was a replacement for the rear-wheel drive V-body Cadillac Catera.

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.

All Sigma vehicles are built at the purpose-built Lansing Grand River factory in Lansing, Michigan.

Vehicles based on this platform:

• 2003-2007 Cadillac CTS
• 2004-2009 Cadillac SRX
• 2005–2011 Cadillac STS (SLS continues in China)

Sigma II

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.

Applications:

• 2008–2013 Cadillac CTS
• 2009–2015 Cadillac CTS-V