Vortec 5.3L V8 SFI FlexFuel, 4-Speed Automatic with Overdrive, 4WD, and Cloth. Black Beauty! Extended Cab! This is a fresh trade more info and pics to come! GMC has done it again! They have built some wonderful vehicles and this fantastic 2008 GMC Sierra 1500 is no exception! This Sierra SLE1 series is an example of the GM truck that won pretty much every award out there when it was redesigned the year before. Simply one of the smoothest-riding and quietest half-tons you'll ever drive, or ride in. Awarded Consumer Guide's rating of a Recommended Large Pickup in 2008.