Vortec 5.3L V8 SFI Aluminum Block, 4-Speed Automatic with Overdrive, and 4WD. Extended Cab! Red and Ready! Just think of all the work you can get done once you are cruising off in this hard-working 2005 Chevrolet Silverado 1500. Some of your employees may let you down from time to time, but not this rock solid truck. New Car Test Drive said it ...remains one of the best-driving full-size pickups...It feels tight and quiet, with little road noise or wind noise...