Vortec 5.3L V8 SFI, 4-Speed Automatic with Overdrive, and 4WD. Extended Cab! White Knight! Have Peace of Mind !! All pre-owned vehicles under 120,000 miles include a 3 month 3,000 mile. Are you interested in a truly wonderful truck? Then take a look at this beautiful 2007 GMC Sierra 1500. It scored the top rating in the IIHS frontal offset test. This spirited machine can turn the everyday driver into a gearhead as they experience a whole new kind of acceleration and exceptionally potent power.