Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6L Turbo-Diesel V8

For the toughest jobs, the available Duramax 6.6L Turbo-Diesel V8 brings commanding output—470 horsepower and 975 lb-ft of torque—matched to a 10-speed automatic designed to stay in the sweet spot for towing. That wide torque band translates to confident launches with heavy trailers, controlled passing power on mountain highways, and sure-footed pull at job-site speeds. When properly configured on a dual-rear-wheel 3500 HD with a gooseneck hitch, the Sierra can tow up to 36,000 pounds, and up to 32,000 pounds with a fifth-wheel. Diesel drivers will also appreciate the poised ride and the sense of stability you get from a chassis tuned for the load, backed by stout brakes, smart cooling, and transmission programming honed for steep grades and sustained work.

6.6L Gas V8 with 10-Speed Automatic

The standard 6.6L gas V8 supplies 401 horsepower and 464 lb-ft of torque, providing reliable pull for daily towing, equipment runs, and mixed-duty schedules. Paired with a 10-speed automatic, this powertrain feels responsive in traffic and settled at highway speeds, with gear spacing designed to keep the engine in its power band when accelerating with payload in the bed. For owners who need heavy-duty capability without the diesel’s extra torque, the 6.6L gas V8 is a proven, straightforward choice. It’s a great fit for businesses that rack up city miles, handle varied loads, and value a smooth, predictable drive backed by readily available fueling and service.

ProGrade® Trailering System with up to 15 Camera Views

Visibility builds confidence—especially with longer, taller trailers. Available ProGrade® Trailering technology supports up to 15 camera views when properly equipped, including hitch guidance, surround views that help you spot obstacles, and perspectives tailored for fifth-wheel and gooseneck setups. The system’s trailer-centric tools streamline hitching, lane changes, and low-speed maneuvering around job sites or campgrounds. For weekend haulers and daily pros alike, those viewpoints reduce guesswork, which helps minimize wear on equipment, trims time at the job, and enhances safety when space gets tight. Pair this with integrated trailering checklists and trailer profile settings, and you have a cohesive toolkit for repeatable, stress-reduced towing.

MultiPro Tailgate and Bed Utility

The available MultiPro Tailgate transforms the rear of the Sierra HD into a more capable workstation. With multiple positions—ranging from a full-width step for easier bed access to a load-stop function for longer materials—the tailgate supports quick loading and unloading, on-the-go laptop work, and safer footing when you’re in and out of the bed throughout the day. Built-in corner steps, available LED bed lighting, movable tie-downs, and an available 120-volt outlet further optimize the box for both job and weekend duty. The result is less effort, faster setups, and a truck bed that keeps pace with your schedule.

13.4-Inch Infotainment with Google Built-in

Inside, available 13.4-inch infotainment with Google Built-in brings a crisp, intuitive interface to navigation, communication, and media. Wireless Apple CarPlay and Android Auto compatibility keep your phone’s essential apps at your fingertips, while an available 12.3-inch digital gauge cluster feeds clear, configurable vehicle information to the driver. These displays shine during long interstate hauls and daily runs alike, giving you seamless access to maps, messages, and truck systems. Complementing the tech suite are available safety and driver-assistance features, including automated emergency braking, lane-departure warning, and automatic high-beam headlights, along with available blind-spot monitoring, rear cross-traffic alert, and adaptive cruise control that supports confident, less-fatiguing trips with or without a trailer.