| AT4X | Duramax 6.6L V8 Turbo-Diesel | 4WD | 10-Speed Automatic | Crew Cab | Off-Road Suspension with DSSV Dampers | Gooseneck/5th Wheel Prep Package | Power Retractable Assist Steps | Finished in Sterling Metallic with an Obsidian Rush interior, this 2026 GMC Sierra 2500 HD AT4X Crew Cab 4WD is powered by a Duramax 6.6L V8 Turbo-Diesel engine paired with a 10-speed automatic transmission. Built for exceptional off-road capability and heavy-duty towing, it features an off-road suspension with DSSV dampers, a 2-speed active electronic Autotrac transfer case, trailer brake controller, digital variable steering, a rear electronic locking differential, a Trailering Package with Hitch Guidance and Hitch View, an In-Vehicle Trailering App, a Gooseneck/5th Wheel Prep Package, dual alternators, and a high idle switch. The premium interior offers a 16-way power driver seat, heated and ventilated front seats, heated second-row outboard seats, a heated leather-wrapped steering wheel, dual-zone automatic climate control, driver seat and mirror memory, a power sliding rear window, Universal Home Remote, wireless charging, premium floor liners, a power sunroof, 120-volt AC power outlets in both the instrument panel and cargo bed, and a 12.3-inch diagonal reconfigurable Driver Information Centre. Technology includes a GMC Premium Infotainment System with a 13.4-inch diagonal colour touchscreen featuring Google Built-In compatibility including navigation capability and Bluetooth for most phones, wireless Apple CarPlay, wireless Android Auto, a Bose Premium Series 12-speaker audio system, a multicolor 15-inch diagonal Head-Up Display, Rear Camera Mirror, Bed View Camera, OnStar Basics, and SiriusXM Audio with a 3-year SiriusXM subscription. Safety features include Sierra HD Pro Safety with Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Following Distance Indicator, IntelliBeam automatic high beams, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, Driver Safety Alert Seat, HD Surround Vision, Front and Rear Park Assist, and Adaptive Cruise Control. The exterior is equipped with power retractable assist steps with LED perimeter lighting, 18-inch machined aluminum wheels with gloss black accents, LT305/70R18 35-inch mud-terrain tires, a spray-on bed liner, animated LED projector headlamps, front LED fog lamps, and power adjustable heated mirrors with auto-dimming upper glass and integrated turn signals. **AMVIC Licensed Dealer** Stock Number: T4358245