Vortec 5.3L V8 SFI VVT FlexFuel, 6-Speed Automatic, and 4WD. Only one owner! Come to Astro at Exit 132 Buick GMC! One Owner! Who could say no to a simply outstanding truck like this beautiful 2011 GMC Sierra 1500? Some manufacturers cut corners to save money, but GMC didn't try to shave off a single penny when building this excellent Sierra 1500. Awarded Consumer Guide's rating of a Recommended Large Pickup in 2011.