Our diesel-powered 2026 GMC Sierra 2500HD Denali Crew Cab 4X4 in Onyx Black is for owners who aim higher! Motivated by a TurboCharged 6.6 Liter DuraMax Diesel V8 offering 470hp and 975lb-ft of torque to a 10 Speed Allison Automatic transmission for advanced capability. This Four Wheel Drive truck is also easy to handle on or off with Digital Variable Steering, an off-road suspension, and a 2-speed transfer case. Deluxe Sierra design cues include LED lighting, 20-inch wheels, chrome assist steps, matching recovery hooks, a spray-on bedliner, and an exclusive MultiPro tailgate.Level up to our Denali cabin for luxurious details like heated/ventilated perforated-leather power front and heated rear seats, a heated-wrapped steering wheel, dual-zone automatic climate control, open-pore wood trim, a power rear window, and remote start. Backed by Bose audio, the infotainment system bundles a 12.3-inch driver display, a 13.4-inch touchscreen, WiFi compatibility, wireless charging, Apple CarPlay®/Android Auto®, Google Built-in, Bluetooth®, and voice control.GMC delivers smart driver assistance with HD surround vision, a bed-view camera, trailer-compatible blind-spot monitoring, a ProGrade trailering system, automatic braking, front/rear parking sensors, trailer-sway control, and more. When tough jobs call, our bold Sierra 2500HD Denali is ready to answer! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Toward Ownership!