Vortec 5.3L V8 SFI Aluminum Block, 4-Speed Automatic with Overdrive, 4WD, and 4WD/4x4. You win! Z71 Package! Imagine yourself behind the wheel of this rock solid 2005 Chevrolet Silverado 1500. Let bygones be bygones. Just because you bought those slow and boring vehicles in the past, doesn't mean you have to keep repeating your mistakes. The fast lane is now available. New Car Test Drive called it ''...a strong, rigid platform. It is, as the advertising tagline says, like a rock...''