Vortec 4.8L V8 SFI, 4-Speed Automatic with Overdrive, and 4WD. Extended Cab! Oh yeah! Creampuff! This handsome 2007 GMC Sierra 1500 Classic is not going to disappoint. There you have it, short and sweet! Don't get stuck in the mudholes of life. 4WD power delivery means you get traction whenever you need it. J.D. Power named the 2007 Sierra 1500 Classic as the highest ranked in Overall Initial Quality Design in its class.