Silver Birch Metallic 2008 GMC Sierra 3500HD SLT 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 Turbodiesel Duramax 6.6L V8 Turbodiesel, Allison 1000 6-Speed Automatic, 4WD, Light Titanium/Dark Titanium Accents w/Ultrasoft Leather-Appointed Seat Trim, ABS brakes,... via CarSoup