Recent Arrival! 2021 GMC Sierra 3500HD SLT 4D Crew Cab FREE DELIVERY ANYWHERE IN COLORADO **, PREMIUM SOUND **, 4 WHEEL DRIVE. Duramax 6.6L V8 Turbodiesel 10-Speed Automatic 4WDThis Sierra 3500HD comes with the FULL Mike Maroone a 60-Day 3000 Mileage Powertrain Warranty. We will review our technician’s vehicle inspection report with you before purchase. Our intention is to provide you a completely transparent buying experience. At Mike Maroone our used vehicles are Safety Checked, Warrantied, CarFax, and if you don’t like it … Bring it back! For more information or vehicles like it, stop by Mike Maroone North today. We are just north of the Chapel Hills mall behind Walmart in the Chapel Hills Auto Mall.