13.4 GMC Premium Infotainment System with Google Built-In | 12.3 Driver Information Centre | Multicolour 15 Head-Up Display | Power Sunroof | Bose Premium 12-Speaker Sound System | Power Retractable Assist Steps | Spray-On Bedliner | Gooseneck/5th Wheel Prep Package | Heated & Ventilated Front Seats | Heated Steering Wheel & Rear Outboard Seats The 2026 GMC Sierra 2500HD AT4X Crew Cab 4WD delivers extreme off-road capability and heavy-duty towing capacity, finished in Sterling Metallic with an Obsidian Rush full-leather interior. Powered by the Duramax 6.6L V8 Turbo Diesel engine paired with an Allison 10-speed automatic transmission, a 3.42 rear axle ratio, and a 11,350 lb (5,148 kg) GVWR, this heavy-duty truck comes equipped with a High Idle Switch and the factory Gooseneck/5th Wheel Prep Package. Performance and off-road engineering are driven by a specialized off-road suspension featuring Multimatic DSSV dampers, a 2-speed active electronic Autotrac transfer case, rear electronic locking differential, and Digital Variable Steering. The exterior features animated LED projector headlamps, LED front fog lamps, power-folding and auto-dimming heated trailering mirrors with integrated turn signals, power-retractable assist steps with LED perimeter lighting, spray-on bedliner, and 120V AC bed power outlets. Inside, the luxury-appointed cabin offers 16-way power driver seat adjustments, heated and ventilated front bucket seats with driver seat and mirror memory, heated second-row outboard seating, a heated leather-wrapped steering wheel, power sunroof, power-sliding rear window, dual-zone automatic climate control, Universal Home Remote, wireless device charging, and premium floor liners. Technology and infotainment are anchored by a 13.4-inch GMC Premium Infotainment System with Google built-in compatibility, wireless Apple CarPlay and Android Auto, a 12.3-inch digital Driver Information Centre, a 15-inch multicolour Head-Up Display, Rear Camera Mirror, Bed View Camera, a Bose Premium 12-speaker sound system, SiriusXM capability, and OnStar Basics (up to 8 years). Comprehensive safety and trailering technology are provided by Sierra HD Pro Safety, featuring Adaptive Cruise Control, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, HD Surround Vision, Front and Rear Park Assist, Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Driver Alert Safety Seat, integrated Trailer Brake Controller, and an in-vehicle Trailering App with Hitch Guidance and Hitch View. Stock #T4379944 AMVIC LICENSED DEALER