2015 GMC Sierra 3500HD Denali in Summit White, 4WD, One Owner, Clean CarFax, 6.6L DURAMAX TURBO DIESEL, 4X4, LOW MILES, NAVIGATION, SUNROOF, LEATHER HEATED COOLED SEATS, REAR CAMERA, SPRAY IN BED LINER, CREW CAB TRUCK, GREAT CONDITION, and WONT LAST. Allison 1000 6-Speed Automatic, 4WD, and Jet Black w/Perforated Leather Appointed Seat Trim. Want to stretch your purchasing power? Well take a look at this good-looking 2015 GMC Sierra 3500HD. This outstanding GMC is one of the most sought after used vehicles on the market because it NEVER lets owners down.