2026 GMC Sierra 1500 AT4

Vehicle Description

2026 GMC Sierra 1500 AT4 Crew Cab 4WD for Sale in Mobridge, SD

Capability and refinement converge in this 2026 GMC Sierra 1500 AT4 Crew Cab 4WD, finished in striking Coastal Dune over Jet Black with Kalahari accents. The AT4 is GMC's signature off-road half-ton — equipped with a 6.2L EcoTec3 V8, 10-speed automatic, 2-inch factory lift, Rancho monotube shocks, and a 2-speed Autotrac transfer case with auto-locking rear differential. It was built for South Dakota and North Dakota drivers who need a truck that handles a gravel section line on Monday and pulls a stock trailer to the sale barn on Tuesday.

Inside, perforated leather seats, a 13.4-inch infotainment screen, and a 12.3-inch digital driver display deliver the technology and comfort you'd expect at this price point. Off-road high-clearance steps, AT4-specific exterior styling, and the GMC MultiPro tailgate round out a truck that looks every bit as purposeful as it drives.

2026 GMC Sierra 1500 AT4 Crew Cab 4WD — Stock #6W51

• Drivetrain: Four-Wheel Drive (4WD) with 2-Speed Autotrac Transfer Case and Auto-Locking Rear Differential


• Engine: 6.2L EcoTec3 V8 with Dynamic Fuel Management


• Transmission: 10-Speed Automatic


• Exterior Color: Coastal Dune


• Interior: Jet Black with Kalahari Perforated Leather Seating


• AT4 Off-Road Hardware: Factory 2-Inch Lift, Rancho Monotube Shocks, Skid Plates, Hill Descent Control, and Off-Road Mode


• Performance: Adaptive Cruise Control, StabiliTrak with Trailer Sway Control, and Hill Start Assist


• Towing & Trailering: Trailering Package, Integrated Trailer Brake Controller, In-Vehicle Trailering App, and Trailer Side Blind Zone Alert


• Interior Comfort: Heated and Ventilated Front Bucket Seats, Heated Rear Outboard Seats, Heated Steering Wheel, Dual-Zone Automatic Climate Control, and Wireless Charging


• Technology: 13.4-inch Diagonal Color Touchscreen with Google Built-In, Wireless Apple CarPlay and Android Auto, Bose Premium Audio, and 12.3-inch Digital Driver Information Center


• Safety: GMC Pro Safety, HD Surround Vision, Rear Cross Traffic Braking, Lane Keep Assist with Lane Departure Warning, and Front and Rear Park Assist


• Exterior Highlights: LED Headlamps and Tail Lamps, GMC MultiPro Tailgate, Off-Road High-Clearance Assist Steps, AT4-Specific Black Grille and Recovery Hooks, and 18-Inch Gloss Black Aluminum Wheels

Expert Insights

According to Kelley Blue Book and Edmunds, the Sierra 1500 AT4 is widely regarded as one of the most capable factory off-road half-tons on the market — combining real trail hardware with the upscale interior GMC is known for. Reviewers consistently highlight the AT4 as the right pick for buyers who want true off-road capability without sacrificing daily comfort or pulling power.

Visit Beadle Chevrolet–GMC in Mobridge, SD

Come see this 2026 GMC Sierra 1500 AT4 Crew Cab 4WD at Beadle Chevrolet–GMC in Mobridge, South Dakota. We serve customers from Aberdeen, SD, Bismarck, ND, and Pierre, SD — all within two hours. Call us at 605-845-7277 or visit beadleautogroup.com to schedule your test drive!