2026 GMC Sierra 2500HD AT4X

The Coastal Dune paint gets your attention first, but the real story is everything underneath this 2026 GMC Sierra 2500HD AT4X Crew Cab 4x4. Gloss-black front and rear bumpers, a gloss-black grille, black exterior details and red recovery hooks give this hard-to-find heavy-duty GMC a bold custom appearance. Inside, the exclusive Obsidian Rush full-grain leather cabin brings premium comfort to a truck built for serious off-road use. The AT4X features a factory 1.5-inch suspension lift with exclusive Multimatic DSSV dampers, upgraded control arms, revised steering knuckles and heavy-duty three-stage rear leaf springs borrowed from the Sierra 3500HD. Front aluminum and steel transfer-case skid plates help protect important components, while Hill Descent Control, a two-speed Autotrac transfer case and a driver-selectable locking rear differential provide added control on difficult terrain. Brand-new Fuel wheels and brand-new all-terrain tires complete the truck with an aggressive, balanced stance. Power comes from the proven 6.6-liter Duramax turbo-diesel V8 paired with the smooth Allison 10-speed automatic transmission. A 3.73 rear axle, Digital Variable Steering Assist, heavy-duty air filtration and auxiliary engine and transmission coolers prepare this Sierra for demanding work. With an 11,025-pound GVWR, this AT4X combines off-road capability with the strength expected from a heavy-duty diesel. The ProGrade Trailering System includes an integrated trailer brake controller, Hitch Guidance with Hitch View and GMC’s in-vehicle trailering app. Trailer Side Blind-Zone Alert, trailer-camera provisions, a bed-view camera and trailer tire-pressure sensors provide valuable information while connecting or pulling a trailer. HD Surround Vision, front and rear parking assistance and power-folding and extending heated trailering mirrors add even more visibility. Inside, the AT4X offers heated and ventilated 16-way power front seats with lumbar adjustment, memory and a massage feature. Heated rear outboard seats, a heated leather-wrapped steering wheel, dual-zone climate control and a power sunroof keep everyone comfortable. The Rear Camera Mirror, 15-inch multicolor head-up display, wireless charging, power-sliding rear window and power-retractable assist steps add premium convenience. Technology includes GMC’s 13.4-inch infotainment touchscreen with Google built-in compatibility, navigation, Bluetooth, wireless Apple CarPlay and wireless Android Auto. A 12.3-inch reconfigurable driver display keeps important vehicle and trailering information directly in view, while the Bose 12-speaker premium audio system delivers excellent sound. The MultiPro Tailgate Audio System by Kicker, 120-volt interior and bed outlets, spray-on bedliner, LED bed lighting and six-function MultiPro Tailgate make this truck ready for work or recreation. Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Adaptive Cruise Control, Rear Cross-Traffic Alert and the Safety Alert Seat provide added confidence. Unique Trucks is located in Scottsdale, Arizona, specializing in lifted trucks, custom diesels and hard-to-find heavy-duty 4x4 models like this Sierra AT4X. We are a one-of-a-kind dealership where the price you see is the price you pay—everything is included, with no additional dealer markups or surprise add-ons. Come check out this Coastal Dune Duramax and take it for a test drive, or call us and let us work out the best deal with you over the phone. Ask about our no-obligation delivery service and we can bring the truck directly to your doorstep, giving you the chance to see it, touch it and experience it at home before deciding if it is the right truck for you.