GM Sigma 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. Development of the Sigma platform began at Holden in Australia before 1998 as GWRD or Global World Rear Drive.
The long-wheelbase Cadillac STS replaced the front-wheel drive GM K 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:
- Cadillac CTS 2003–2007
- Cadillac SRX 2004–2009
- Cadillac STS 2005–2011 (SLS continues in China)
Read more about GM Sigma Platform: Sigma II
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