Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6L Turbo-Diesel V8

The available Duramax 6.6L Turbo-Diesel V8 is the heart of the Sierra 3500 HD’s heavy-hauling capability, sending 470 horsepower and 975 lb-ft of torque through a 10-speed automatic transmission to help you launch smoothly, climb steadily, and maintain control when loaded. Diesel-friendly gear spacing helps keep the engine in its torque band, while strong engine braking assists on steep descents with a trailer attached. For drivers who regularly move big fifth-wheels or goosenecks, this powertrain is a difference-maker—settled at highway speeds with reserve power for passing, and stout in low-speed maneuvers when positioning a load. It’s an ideal pairing for the available dual rear wheel configuration, maximizing stability for the heaviest ratings.

Maximum Gooseneck and Fifth-Wheel Tow Ratings

When properly equipped, the Sierra 3500 HD reaches a maximum gooseneck tow rating of up to 36,000 pounds, supported by a robust frame, reinforced bed mounting points, and integrated trailering hardware. The fifth-wheel maximum reaches up to 32,000 pounds, allowing you to confidently move large RVs, toy haulers, or multi-axle equipment trailers. The 3500 HD’s available dual rear wheel axle increases load-bearing stability and pin-weight support, while rear suspension tuning and available towing mirrors help maintain poise and clarity. Paired with calibrated transmission logic and selectable tow/haul modes, the truck is engineered to help you control weight, temperature, and braking forces across changing terrain and weather.

Six-Function MultiPro Tailgate

The MultiPro tailgate adds six functional positions that elevate daily usability: a primary gate for standard loads, a load-stop to secure longer items, a fold-down inner gate for closer access, a full-width step for easier bed entry, an inner gate load-stop for second-tier loading, and a work surface setup. When you’re hauling gear and tools—boards, conduit, compressors, or coolers—the flexibility pays off at every stop. Combine the MultiPro tailgate with available bed lighting, movable tie-downs, and an in-bed 120-volt outlet to convert the box into a jobsite-ready station. Built-in corner and bedside steps further simplify loading and inspection when your truck is fully packed.

13.4-inch Diagonal Touchscreen with Google Built-in

Available infotainment centers around a 13.4-inch diagonal touchscreen that’s easy to see and operate with gloves, with Google Built-in for native Google Maps, Assistant, and Play. Wireless Apple CarPlay and Android Auto make phone integration seamless, while an available 12.3-inch digital gauge cluster presents critical powertrain and trailering data at a glance. Configure multiple camera views, trailer profiles, maintenance reminders, and navigation routes directly from the screen. Add the available Bose premium audio system for crisp sound in the roomy double- and crew-cab layouts, making long days more comfortable and keeping your team connected without fuss.

15-View Camera System and Trailering Tools

Trailering confidence starts with visibility, and the Sierra 3500 HD’s available 15-view camera system is designed for it. Strategically placed cameras deliver front, rear, hitch, surround, and available transparent trailer views, helping you assess clearances, line up precisely, and spot obstacles. Create and save trailer profiles with tire pressure monitoring compatibility and maintenance logs, then run pre-departure checklists from the screen to confirm lights and connections. Standard safety tech such as automated emergency braking, lane-departure warning, and automatic high-beam headlights bolsters situational awareness, while available blind-spot monitoring, rear cross-traffic alert, and adaptive cruise control can help reduce fatigue on longer routes.