13.4 GMC Premium Infotainment | Technology Package with 15 Head-Up Display & Rear Camera Mirror | Off-Road Suspension with DSSV Dampers | Bose® Premium Series 12-Speaker System | Power Sunroof | Power-Retractable Assist Steps | The 2026 GMC Sierra 2500 HD Crew Cab AT4X 4WD, finished in Sterling Metallic with an exclusive Obsidian Rush interior, blends heavy-duty capability with overland readiness and luxury. Powered by the elite Duramax 6.6L V8 Turbo-Diesel engine and Allison 10-speed automatic transmission, trailer brake controller, and a Gooseneck/5th Wheel Prep Package. Specialized off-road engineering includes a suspension with race-bred DSSV dampers, a 2-speed Autotrac transfer case, Digital Variable Steering, skid plates, Hill Descent Control, and a rear electronic locking differential. The aggressive profile is detailed with animated LED projector headlamps, power-adjustable trailering mirrors, power-retractable assist steps with LED perimeter lighting, a spray-on bedliner, cargo tie-downs, and 18 machined aluminum wheels wrapped in 35 mud-terrain tires. Inside, the tech-forward AT4X cabin centers around a 13.4 GMC Premium Infotainment touchscreen with Google built-in, a 12.3 digital driver information centre, a 15 Head-Up Display, a Rear Camera Mirror, and a Bed View Camera. Executive travel amenities include a power sunroof, a Bose® Premium Series 12-speaker sound system, wireless charging, dual-zone automatic climate control, a high idle switch, upfitter switches, and 120V AC outlets. Premium seating features 16-way power-adjustable heated and ventilated front bucket seats with driver's memory, a heated leather-wrapped steering wheel, and heated second-row outboard seats. Advanced safety and trailering security are fully managed by Adaptive Cruise Control, HD Surround Vision, Front and Rear Park Assist, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, and the comprehensive Sierra HD Pro Safety suite with a haptic Safety Alert Seat. Stock #T4125722 AMVIC LICENSED DEALER