4D Extended Cab and Vortec 4.8L V8 SFI. Let's get to work! Trusty! How reassuring is the proven work ethic of this stout 2005 Chevrolet Silverado 1500? New Car Test Drive called it ...the smoothest, quietest, most civilized, best equipped, and most enjoyable pickup truck we've ever driven... If necessity is the mother of invention, obviously the designers were late a lot when they drew up this truck. Looks like they won't be tardy anymore...this thing is QUICK!