2026 GMC Sierra 2500HD AT4

Vehicle Description

2026 GMC Sierra 2500HD AT4 Crew Cab 4WD for Sale in Mobridge, SD

Off-road capability meets heavy-duty diesel power in this 2026 GMC Sierra 2500HD AT4 Crew Cab 4WD. The formidable Duramax 6.6L Turbo-Diesel V8 pairs with the Allison 10-speed automatic for serious towing and payload, while the AT4's off-road hardware and Traction Select System with off-road mode make it ready for the toughest jobs and terrain. Finished in Summit White with a Jet Black interior featuring Kalahari accents, this AT4 is as rugged as it is refined.

Built for work and adventure, this Sierra 2500HD AT4 includes a 2-speed AutoTrac transfer case, 120V bed power outlet, and GMC's advanced trailering technology — a genuine heavy-duty workhorse with premium comfort.

2026 GMC Sierra 2500HD AT4 Crew Cab 4WD — Stock #6W118

• Drivetrain: Four-Wheel Drive (4WD) with 2-Speed AutoTrac Transfer Case


• Engine: Duramax 6.6L Turbo-Diesel V8


• Transmission: Allison 10-Speed Automatic


• Exterior Color: Summit White


• Interior: Jet Black with Kalahari accents


• Packages: AT4 trim with Traction Select System, off-road and tow-haul modes, and Technology Package


• Off-Road & Capability: 2-speed AutoTrac transfer case, off-road tuning, and 120V power outlet in cargo bed


• Interior Comfort: Heated front seats, heated steering wheel, dual-zone climate control, and power-folding heated trailer mirrors with auto-dim


• Technology: GMC Premium Infotainment touchscreen with Google Built-In, wireless Apple CarPlay and Android Auto, 8 years OnStar Basics, and SiriusXM audio


• Towing & Trailering: Integrated trailer brake controller, power fold/extend heated trailer mirrors, and CornerStep rear bumper


• Exterior Highlights: LED cargo area lighting, spray-on bedliner, and AT4-specific styling

Expert Insights

According to Kelley Blue Book and Edmunds, the GMC Sierra 2500HD AT4 stands out for combining serious off-road hardware with class-leading Duramax-and-Allison towing capability and an upscale cabin. For buyers who need heavy-duty muscle and genuine trail capability, it is a standout choice.

Visit Beadle Chevrolet–GMC in Mobridge, SD

Come see this 2026 GMC Sierra 2500HD 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!