Summit White 2019 GMC Sierra 2500HD Denali 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 Turbodiesel Steven's Means Savings, Allison 1000 6-Speed Automatic, 4WD, Jet Black Leather. No dealer fees on this listing are included! Buyers must take delivery within 48hrs.... via LIUsedCars