ONE OWNER TRUCK SIERRA MAX!!!! Vortec 6.0L V8 SFI VVT, 4-Speed Automatic Super Duty, and 4WD. One-owner! Crew Cab! When was the last time you smiled as you turned the ignition key? Feel it again with this fantastic-looking 2007 GMC Sierra 1500. Caveat Emptor. Buyer Beware. It will produce breakneck acceleration. Use at your own risk. J.D. Power and Associates gave the 2007 Sierra 1500 4.5 out of 5 Power Circles for Overall Initial Quality.