The 2026 GMC Sierra 3500 HD delivers the kind of muscle you'd expect from a serious work truck. Under the hood, drivers can choose from a capable 6.6-liter V8 gasoline engine or opt for the available 6.6-liter Duramax turbo-diesel V8, which produces up to 470 horsepower and 975 pound-feet of torque. The diesel option pairs with an Allison 10-speed automatic transmission, giving you smooth, confident power delivery whether you're climbing grades or hauling heavy payloads. Maximum conventional towing capacity reaches up to 23,200 pounds, making the Sierra 3500 HD one of the most capable trucks in its class.

Step inside the 2026 Sierra 3500 HD and you'll find a cabin that blends work-ready utility with genuine comfort. Available seating accommodates up to six passengers across configurations, and higher trim levels wrap occupants in premium materials including leather-appointed seating surfaces and real wood accents. The available Multi-Pro tailgate continues to impress with its six functional positions, and the Sierra's thoughtfully designed storage solutions keep the cab organized on even the busiest workdays. Whether you're running a job site or spending long hours behind the wheel, the interior is designed to keep fatigue at bay.

The 2026 Sierra 3500 HD comes equipped with a host of technology features that enhance both the driving experience and work-site productivity. A standard 13.4-inch diagonal touchscreen powers the GMC infotainment system, with wireless Apple CarPlay and Android Auto compatibility for seamless smartphone integration. Available features include a head-up display, rear camera mirror, and the impressive Multi-Flex tailgate with an available integrated step. For towing confidence, the available ProGrade Trailering System features up to 14 camera views, a Transparent Trailer view, and Trailer Side Blind Zone Alert to keep you aware of your surroundings at all times.

GMC engineers the Sierra 3500 HD with driver confidence in mind. The truck comes equipped with an available suite of driver-assist technologies designed to support you on the job and on the road. Highlights include Forward Collision Alert, Automatic Emergency Braking, Lane Keep Assist with Lane Departure Warning, and IntelliBeam automatic high-beam assist. Available Rear Cross Traffic Alert and Blind Zone Steering Alert add an extra layer of awareness when maneuvering in tight spaces. These advanced safety features work quietly in the background, letting you focus on the task ahead.

The 2026 GMC Sierra 3500 HD offers a well-structured lineup of trim levels to match a wide range of work and lifestyle needs. The entry-level Pro trim provides a strong foundation of capability at an accessible price point, while the SLE and SLT trims add progressively more comfort and convenience features. The AT4 trim brings off-road-ready hardware including an available off-road suspension and skid plates for those who venture beyond paved roads. At the top of the range, the Denali and Denali Ultimate trims deliver a luxury-truck experience with premium materials, exclusive styling, and the most advanced technology the Sierra 3500 HD has to offer.

Drivers in Iron Mountain, MI, looking for a heavy-duty truck that delivers on every front will find the 2026 GMC Sierra 3500HD to be a compelling choice. From its formidable towing and payload capabilities to its refined cabin and cutting-edge technology, this truck is purpose-built to handle whatever comes its way. Stop by to explore the full lineup and find the Sierra 3500 HD configuration that's right for you.