Sierra 2500HD Denali, 4D Crew Cab, Duramax 6.6L V8 Turbodiesel, Allison 1000 6-Speed Automatic, 4WD, White, and Leather. Turbo! Diesel! Want to stretch your purchasing power? Well take a look at this attractive 2013 GMC Sierra 2500HD. Just one quick launch from a stoplight and you'll be SOLD! Nobody can resist the get-up-and-go in this truck. Prices do not include government fees and taxes, any finance charges, any dealer document processing charge, any electronic filing charge, and any emission testing charge.