6-Speed Automatic and 4WD. Crew Cab! Short Bed! Want to save some money? Get the NEW look for the used price on this outstanding 2012 GMC Sierra 1500. It’s got that fresh aroma that indicates the previous owner probably kept it spotless and was a non-smoker. FlexFuel ability. Consumer Guide calls Sierra surprisingly pleasant and manageable for such large, hefty vehicles. Home of the Lifetime Warranty!!