Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6L Turbo-Diesel V8

For serious towing, the available Duramax 6.6L Turbo-Diesel V8 is the difference-maker. Engineered for sustained torque output and thermal management under load, this engine is rated at 470 horsepower and a massive 975 lb-ft of torque, channeled through a 10-speed automatic that keeps the engine squarely in its sweet spot. That translates to reassuring throttle response at low speeds, minimal hunting for gears on grades, and enough passing power to confidently merge or overtake with a heavy trailer. Paired with the right configuration, the strongest 3500 HD models can pull up to 36,000 pounds with a properly equipped gooseneck setup, or up to 32,000 pounds with a properly equipped fifth-wheel setup. If your workday involves frequent towing at or near max capacity, the Duramax brings calm composure, predictable power delivery, and the endurance you want in a heavy-duty diesel.

Dual-Rear-Wheel 3500 HD Configuration

When you need stability and capacity at the highest levels, the 3500 HD’s available dual-rear-wheel configuration becomes essential. The wider rear stance and additional contact patch provide a more planted feel, especially with tall or heavy trailers affected by crosswinds. On rough pavement or loose surfaces, the dually’s added stability translates into less steering correction and less sway, helping reduce driver fatigue over long distances. It also supports the 3500 HD’s top trailering figures when paired with the diesel engine, rear-wheel drive, a regular cab, and the proper hitch hardware. For contractors, agricultural users, and multi-state haulers who depend on sustained, predictable control under load, the dual-rear-wheel setup is a practical ally that pays dividends every mile.

MultiPro Tailgate

GMC’s MultiPro tailgate is a hallmark of Sierra HD utility. Designed with six distinct positions, it functions as a traditional tailgate, a load-stop for long cargo, a step for easier bed access, and a work surface for on-the-go tasks. Owners also appreciate how the step position reduces strain when climbing into the bed, and how the built-in load-stop helps secure awkward cargo without fighting multiple tie-downs. When you are loading tools in the morning or staging materials on a worksite, the MultiPro tailgate turns the truck’s rear into a versatile staging area that saves time and effort. Paired with available bed lighting, movable tie-downs, and a 120-volt outlet, the Sierra 3500 HD’s bed ecosystem is engineered to keep you moving efficiently.

15-View Camera System

Heavy-duty towing is as much about visibility as it is about raw power. The available camera system with up to 15 views supports precise alignment with trailer hitches, improved awareness around the truck and trailer while maneuvering, and greater confidence on multi-lane roads. From guidelines that help you back up straight to vantage points that reduce blind spots when changing lanes, these views are practical solutions to everyday challenges. Add in available features like rear cross-traffic alert and blind-spot monitoring, and you have a truck that proactively helps you see and respond to your surroundings. For owners who regularly rotate among different trailers, this visibility toolkit accelerates hook-ups and reduces guesswork.

13.4-inch Touchscreen with Google Built-in

Long days are better with intuitive, powerful technology at your fingertips. The available 13.4-inch touchscreen with Google Built-in integrates maps, voice assistance, and app access into a bright, responsive display that is easy to read at a glance. Wireless Apple CarPlay and Android Auto streamline phone integration, while an available Bose premium audio system elevates clarity for calls and podcasts. Many configurations also include a 12.3-inch digital gauge cluster that presents key driver information with crisp graphics. Together, these systems transform the cabin into a command center that supports productivity and reduces distractions, without losing sight of the truck’s primary mission as a heavy-duty workhorse.