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 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. All Sigma vehicles are built at the purpose-built Lansing Grand River factory in Lansing, Michigan. Vehicles based on this platform:

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  • 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 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 * 2007–2013 Cadillac SLS (China) (en)
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  • GM Sigma platform (en)
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  • 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 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. All Sigma vehicles are built at the purpose-built Lansing Grand River factory in Lansing, Michigan. Vehicles based on this platform: (en)
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  • GM Sigma platform (en)
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  • GM Sigma platform (en)
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