http://VacavilleGMC.com 866-593-1568 The 2013 GMC Sierras are offered in base Work Truck as well as XFE, SL, SLE, SLT and luxury Denali trim levels, with a choice of regular, extended and crew cab configurations, plus three different box lengths (5 feet 8-inches, 6-feet, 6-inches and 8-feet (the last offered on regular and extended cab rigs only). Four different engines are available, 4.3-liter V6, as well as 4.8, 5.3 and 6.2-liter V8s. The base motor and the 4.8L are teamed with a four-speed slushbox, while the others come standard with GM's 6L80E six-speed auto-box.
