13.4 GMC Premium Infotainment | Duramax 6.6L V8 Turbo Diesel | AT4 Premium Plus Pkg | 15 Head-Up Display | HD Surround Vision | Bose® Premium Speakers | Power Sunroof | GMC MultiPro Tailgate The 2026 GMC Sierra 3500 AT4 Crew Cab 4WD, finished in Sterling Metallic with a Jet Black/Kalahari interior, is a heavy-duty master powered by the high-output Duramax 6.6L V8 Turbo Diesel engine. This off-road focused truck features 20 high gloss black aluminum wheels, an active 2-speed Autotrac transfer case, and digital variable steering. The exterior is highly functional, equipped with animated LED projector headlamps, the versatile GMC MultiPro Tailgate, power-folding and extending trailering mirrors, and a factory spray-on bedliner. Additional utility is provided by LED roof marker lamps, LED cargo bed lighting, and off-road high clearance steps. The premium interior is centered around a 13.4 diagonal touchscreen with Google built-in and a 12.3 digital driver information centre. The AT4 Premium Plus Package elevates the cabin with a 15 diagonal multi-colour Head-Up Display, a Rear Camera Mirror, and a power sunroof. Comfort features abound, including heated and ventilated front seats, heated second-row outboard seats, a heated wrapped steering wheel, and dual-zone automatic climate control. Connectivity is supported by wireless Apple CarPlay, wireless Android Auto, and wireless phone charging, all complemented by a Bose® premium sound system. Safety and awareness are managed through the Sierra HD Pro Safety suite and advanced trailering tech. Key features include HD Surround Vision, Adaptive Cruise Control, Trailer Side Blind Zone Alert, and a Bed View Camera. The truck is also equipped with an in-vehicle trailering app, hitch guidance with hitch view, and an integrated trailer brake controller. For added convenience, it features a power sliding rear window, a universal home remote, and 120V power outlets in the instrument panel and cargo bed. Stock #T4227374 AMVIC LICENSED DEALER