Built tough and ready to tackle the road, our diesel-powered 2026 GMC Sierra 2500HD AT4 Crew Cab 4X4 in Onyx Black pairs smart technology, versatile truck capability, and a refined cabin designed for everyday productivity. Motivated by a TurboCharged 6.6 Liter DuraMax Diesel V8 providing 470hp and 975lb-ft of torque to a 10 Speed Allison Automatic transmission. This Four Wheel Drive truck also has an off-road suspension, skid plates, hill-descent control, and an Autotrac 2-speed transfer case for getting to hard-to-reach jobs. Our Sierra boasts LED lighting, red recovery hooks, 20-inch high-gloss black alloy wheels, a spray-on bedliner, and a MultiPro tailgate for high-visibility styling. You will love our AT4 cabin, which is your mobile command post for doing more. It features heated/ventilated leather power front seats and heated rear seats, a heated-wrapped steering wheel, dual-zone automatic climate control, keyless access/ignition, remote start, and remarkable technologies. Highlights include a Bose audio system, a 12.3-inch driver display, a 13.4-inch touchscreen, Google Built-in, WiFi compatibility, Apple CarPlay®/Android Auto®, Bluetooth®, and wireless charging. GMC helps you stay safe as you work hard with a surround-view system, a bed-view camera, trailer-capable blind-spot monitoring, automatic braking, parking sensors, lane-departure warning, trailer-sway control, hill-start assistance, and more. When tough jobs call, our Sierra 2500 AT4 is ready to answer! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Towards Ownership! Serving the Westman area for decades, our award-winning dealership and our professional sales staff are here to make your auto shopping experience hassle-free.