13.4 GMC Premium Infotainment Display | Off-Road Suspension with DSSV Dampers | Gooseneck/5th Wheel Prep Package | 15 Head-Up Display | Rear Camera Mirror | Power Sunroof | Power Retractable Assist Steps | Heated & Ventilated Front Seats | Heated 2nd Row Seats | Bose Premium 12-Speaker Audio The 2026 GMC Sierra 2500 AT4X Crew Cab 4WD combines extreme off-road performance with heavy-duty towing capability and premium luxury, finished in a Coastal Dune exterior with an Obsidian Rush interior. Powered by a Duramax 6.6L V8 Turbo-Diesel engine paired with a 10-speed automatic transmission, 3.42 rear axle ratio, and a 11,350 lb (5,148 kg) GVWR, this truck is engineered for heavy capability with off-road suspension featuring Multimatic DSSV dampers, 2-speed active electronic Autotrac transfer case, rear electronic locking differential, digital variable steering, dual alternators (220-amp primary and 170-amp auxiliary), high idle switch, Gooseneck/5th Wheel Prep Package, integrated trailer brake controller, and a full Trailering Package with Hitch Guidance, Hitch View, and In-Vehicle Trailering App. The exterior features power retractable assist steps with LED perimeter lighting, power sunroof, spray-on bedliner, 120V AC power outlet in the cargo bed, animated LED projector headlamps, front LED fog lamps, and power-adjustable heated mirrors with auto-dimming upper glass and integrated turn signals. Inside, the refined cabin offers a 16-way power driver seat, heated and ventilated front seats with driver seat and mirror memory, heated second-row outboard seats, heated leather-wrapped steering wheel, power sliding rear window, premium floor liners, dual-zone automatic climate control, wireless charging, Universal Home Remote, 120V AC instrument panel outlet, keyless open, and remote vehicle start. Technology and connectivity center around a 13.4-inch diagonal GMC Premium Infotainment System with Google built-in compatibility (including navigation), a 12.3-inch diagonal reconfigurable Driver Information Centre, 15-inch multicolor Head-Up Display, Rear Camera Mirror, Bose Premium Series 12-speaker audio system, wireless Apple CarPlay, wireless Android Auto, SiriusXM capability, and OnStar Basics (up to 8 years). Trailering confidence and driver security are provided by Adaptive Cruise Control, HD Surround Vision, Bed View Camera, Front and Rear Park Assist, Driver Safety Alert Seat, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, and Sierra HD Pro Safety features including Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Following Distance Indicator, and IntelliBeam auto high beams. Stock #T4358276 AMVIC LICENSED DEALER