13.4 GMC Premium Infotainment w/ Google Built-In | Duramax® 6.6L V8 Turbo-Diesel | Multimatic DSSV Dampers | 15 Diagonal Head-Up Display | 12-Speaker Bose® Premium Series Audio | Power Sunroof | Gooseneck/5th Wheel Prep Package | 16-Way Power Driver Seat w/ Massage The 2026 GMC Sierra 2500 AT4X Crew Cab 4WD, finished in the unique Coastal Dune with a specialized Obsidian Rush interior, represents the absolute pinnacle of heavy-duty off-road performance. This truck is powered by the legendary Duramax® 6.6L V8 Turbo-Diesel engine and a smooth 10-speed automatic transmission. Engineered to conquer any terrain, the AT4X features a factory-installed off-road suspension with Multimatic DSSV dampers, a rear electronic locking differential, and a 2-speed active electronic Autotrac transfer case. The cabin is a luxury sanctuary, boasting heated and ventilated 16-way power front seats and a 12-speaker Bose® Premium Series audio system. High-end technology is standard, including a 13.4 diagonal colour touchscreen, a 12.3 digital Driver Information Centre, and a multi-colour 15 diagonal Head-Up Display. For added convenience, this build includes power retractable assist steps with LED perimeter lighting, a power sunroof, and Wireless Charging. Utility is unmatched with the Gooseneck/5th Wheel Prep Package, a factory spray-on bedliner, and a high idle switch for demanding job sites. The Trailering Package is fully integrated with Hitch Guidance, Hitch View, and a Bed View Camera. Safety is comprehensive, featuring Adaptive Cruise Control, HD Surround Vision, and Trailer Side Blind Zone Alert. With animated LED projector headlamps and dual-zone automatic climate control, this Sierra 2500 AT4X is the ultimate combination of brute strength and refined tech. AMVIC LICENSED DEALER