Vortec 5.3L V8 SFI VVT FlexFuel 6-Speed Automatic and 4WD. Hold on to your seats! It's time for MIDWAY MOTORS SUPERCENTER! There is no better time than now to buy this terrific 2011 GMC Sierra 1500. Be prepared to be transformed when you get behind the wheel and feel the power surge right into your very soul as you mash the gas and zoom off over the horizon. Awarded Consumer Guide's rating as a 2011 Recommended Large Pickup.