(855) 218-9811(855) 218-9811 Visit eBay Store Full size photos Full size photos 2020 GMC Sierra 3500HD Denali Onyx Black Duramax 6.6L Turbo-Diesel V8 B20-Diesel Stock #: 286326 Exterior Color: Onyx Black Interior Color: Jet Black Body Type: Pickup Truck Transmission: Automatic Drivetrain: Four Wheel Drive Engine: Duramax 6.6L Turbo-Diesel V8 B20-Diesel Compatible Mileage: 94,604 ...