| AT4 | Duramax 6.6L V8 Turbo-Diesel | 4WD | 10-Speed Automatic | Crew Cab | AT4 Premium Plus Package | Gooseneck/5th Wheel Prep Package | Power Sunroof | Finished in Sterling Metallic with a Jet Black/Kalahari interior, this 2026 GMC Sierra 3500 HD AT4 Crew Cab 4WD is powered by a Duramax 6.6L V8 Turbo-Diesel engine paired with a 10-speed automatic transmission. Built for serious capability, it features a 2-speed active electronic Autotrac transfer case, trailer brake controller, digital variable steering, an automatic locking rear differential, StabiliTrak with Trailer Sway Control and Hill Start Assist, 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 includes heated and ventilated front seats, heated second-row outboard seats, a 10-way power driver seat, driver seat and mirror memory, dual-zone automatic climate control, a heated wrapped steering wheel, wireless charging, premium floor liners, a power sliding rear window, Universal Home Remote, 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 highlights include the 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, OnStar Basics, SiriusXM Audio with Trial plus a 3-year SiriusXM subscription, a Bose premium speaker system, Bed View Camera, Rear Camera Mirror, a multicolor 15-inch diagonal Head-Up Display, remote vehicle start, and Adaptive Cruise Control. 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, and Front and Rear Park Assist. The exterior is equipped with 20-inch high gloss black aluminum wheels, animated LED projector headlamps, front LED fog lamps, LED cargo bed lighting, heated power-adjustable auto-dimming mirrors with integrated turn signals, power folding and extending capability with perimeter lighting, rain-sensing wipers, rear wheelhouse liners, a spray-on bed liner, GMC MultiPro Tailgate, EZ-Lift power lock and release tailgate with hitch area lighting, LED roof marker lamps, and power retractable assist steps with LED lighting. **AMVIC Licensed Dealer** Stock Number: T4361718