Vortec 5.3L V8 SFI FlexFuel, 4-Speed Automatic with Overdrive, and 4WD. Get in or get out of the way! Can you handle this much power?! You don't have to worry about depreciation on this gorgeous 2008 GMC Sierra 1500! The guy before you got it all! What a guy! Be prepared to be transformed when you get behind the wheel and feel the power surge through your fingers right into your very soul. Consumer Guide Recommended Large Pickup.