13.4 Diagonal GMC Infotainment w/ Google Built-In | Duramax® 6.6L V8 Turbo Diesel | AT4 Premium Plus Package | 15 Diagonal Head-Up Display | Heated & Ventilated Front Seats | Power Sunroof | GMC MultiPro Tailgate | Bose® Premium Speaker System The 2026 GMC Sierra 2500 4WD AT4 Crew Cab, showcased in crisp Summit White with a refined Jet Black/Kalahari interior, is engineered for those who demand off-road prowess without sacrificing premium comfort. This heavy-duty powerhouse is driven by the high-torque Duramax® 6.6L V8 Turbo Diesel engine, paired with a precision 10-speed automatic transmission. Built to handle any environment, the AT4 features a 2-speed active Autotrac transfer case, an automatic locking rear differential, and digital variable steering. The interior is elevated by the AT4 Premium Plus Package, featuring a multi-color 15 diagonal Head-Up Display, a Rear Camera Mirror, and a power sunroof. The cabin offers a superior experience with heated and ventilated front seats, heated second-row outboard seats, and a heated wrapped steering wheel. Staying connected is effortless thanks to the 13.4 diagonal GMC Premium Infotainment System with Google built-in, complemented by a 12.3 reconfigurable driver information centre and a Bose® premium sound system. Work-ready utility is integrated into every aspect, from the versatile GMC MultiPro Tailgate to the power-retractable assist steps with LED lighting. The Max Trailering Package, which includes the Gooseneck/5th Wheel Prep Package and a 3500 HD frame upgrade, ensures this Sierra is prepared for the heaviest loads. Safety remains a focus with HD Surround Vision, Bed View Camera, and Adaptive Cruise Control. Complete with animated LED projector headlamps and spray-on bed liner, this Sierra 2500 AT4 offers the perfect blend of rugged capability and modern luxury. Stock #T4251348 AMVIC LICENSED DEALER