Vortec 5.3L V8 SFI, 4-Speed Automatic with Overdrive, and 4WD. Talk about rock solid! Let's get to work! There is no better time than now to buy this hard-working 2006 Chevrolet Silverado 1500, ready to get on the job and get going. J.d. Power and Associates gave the 2006 Silverado 1500 5 out of 5 Power Circles for Overall Initial Quality Design. New Car Test Drive called it ...a strong, rigid platform. It is, as the advertising tagline says, like a rock... It's a terrific truck that we have placed at a brilliant price.