Certified. Black 2016 Chevrolet Silverado 2500HD LT RWD 6-Speed Automatic HD Electronic with Overdrive 6.0L 8-Cylinder SFI OHV 6-Speed Automatic HD Electronic with Overdrive. Keyes Chevrolet - Where It's Fun to Buy a Car! Recent Arrival! Chevrolet Certified Pre-Owned... via vAuto, Inc.