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Heavy-Duty 4-Wheel Drive (4WD) system for rugged capability
Off-Road Suspension Package with twin-tube Rancho® shocks & skid plates
Durable all-terrain tires and bold AT4 styling
Powerful engine options including available Duramax® 6.6L Turbo-Diesel V8 with high torque output
Crew Cab configuration with spacious seating
Premium GMC Infotainment System with 13.4″ touchscreen
Apple CarPlay® and Android Auto™ compatibility
Adaptive Cruise Control and advanced trailering tech
Up to 14 available camera views including HD Surround Vision
Trailer-aware tech and ProGrade® Trailering System available
Heated and ventilated perforated front leather seating
Keyless entry and push-button start
Spray-on bedliner and practical cargo solutions
Available Head-Up Display and premium packages
The 2026 GMC Sierra 3500HD AT4 is a heavy-duty powerhouse engineered for serious work, rugged off-road capability, and confident performance in demanding conditions. Built on GMC’s proven heavy-duty platform, the Sierra 3500HD AT4 blends strength, advanced technology, and refined comfort into a truck that’s equally at home on the job site, trail, or highway.
* Every reasonable effort is made to ensure the accuracy of the information listed above. Vehicle pricing, incentives, options (including standard equipment), and technical specifications listed is for the 2026GMCSierra 3500HD AT4 4x4 Crew Cab 6.75 ft. box SRW may not match the exact vehicle displayed. Please confirm with a sales representative the accuracy of this information.
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Stackable vs Non-Stackable: Stackable incentives are discounts that can be combined with cash, finance and/or lease rates should you qualify for them. Please contact a sales representative for more information.