Wireless Apple CarPlay & Wireless Android Auto | Duramax® 6.6L V8 Turbo Diesel | Multimatic DSSV Dampers | Obsidian Rush Full-Grain Leather Interior | 15 Diagonal Head-Up Display | Bose® Premium Series 12-Speaker System | Power-Retractable Assist Steps | 35 Mud-Terrain Tires The 2026 GMC Sierra 2500 AT4X Crew Cab 4WD, finished in sophisticated Sterling Metallic with the exclusive Obsidain Rush interior, represents the absolute pinnacle of heavy-duty off-road luxury. This powerhouse is driven by the legendary Duramax® 6.6L V8 Turbo Diesel engine, delivering massive torque through a smooth-shifting 10-speed Allison® automatic transmission. Engineered for the most demanding terrain, the AT4X features a factory-installed off-road suspension with Multimatic DSSV dampers, a rear electronic locking differential, and large 35 mud-terrain tires mounted on 18 machined aluminum wheels.The cabin is a masterclass in high-tech refinement, featuring 16-way power-adjustable front seats with massage functionality, draped in premium full-grain leather. The tech-focused cockpit includes a 13.4 diagonal infotainment touchscreen with Google Built-In, a 12.3 digital Driver Information Centre, and a massive 15 multi-colour Head-Up Display. For an immersive audio experience, this model is equipped with a Bose® Premium Series 12-speaker system. Additional luxury touches include a power sunroof, heated and ventilated front seats, and heated second-row outboard seats.Utility is maximized with power-retractable assist steps featuring LED perimeter lighting, the versatile GMC MultiPro Tailgate, and a factory spray-on bedliner. Trailering is made effortless via HD Surround Vision, Bed View Camera, and the In-Vehicle Trailering App with Hitch View. Safety is paramount, featuring Adaptive Cruise Control, Trailer Side Blind Zone Alert, and Automatic Emergency Braking. With a 2-speed active Autotrac transfer case and a high idle switch, this Sierra 2500 AT4X is built to dominate both the job site and the trail. Stock # T4208027 AMVIC LICENSED DEALER