Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6-liter turbo-diesel V-8 and 10-speed automatic

Those who tow regularly will gravitate to the Duramax 6.6-liter turbo-diesel V-8, rated at 470 hp and a towering 975 lb-ft of torque. It delivers effortless low-end pull and consistent power under load, routed through a robust 10-speed automatic transmission engineered to keep the engine in the heart of its torque band. The close-ratio gearing helps maintain momentum on grades, aids smooth downshifts with heavy trailers, and optimizes throttle response whether you are maneuvering a gooseneck in a tight yard or merging onto Highway 1. Drivers who prefer gas power can opt for the 401-hp 6.6-liter V-8, which also pairs with the 10-speed for steady, predictable performance. Both powertrains are available with rear-wheel drive or four-wheel drive so you can tailor traction to your routes and terrain.

36,000-pound max trailering and heavy-duty hardware

Configured correctly, the Sierra 3500 HD can tow up to 36,000 pounds with a gooseneck hitch, or up to 32,000 pounds with a fifth-wheel, when equipped with the Duramax, a regular cab, rear-wheel drive, a long bed, and the available dual-rear-wheel axle. That level of capability demands a serious foundation, and the Sierra delivers with a fortified frame, heavy-duty suspension components, and powertrain cooling designed for sustained towing. The available dually rear axle adds stability with a wider footprint and additional rubber, while integrated bed tie-downs, optional bed LED lighting, and a 120-volt outlet help you secure and support cargo. Whether you are moving equipment or a large fifth-wheel, the Sierra’s hardware inspires confidence from hookup to highway cruising.

15-view camera system for trailering

Hookups get easier and lane changes feel more assured with the available camera system offering up to 15 views. From hitch and bed views that simplify connecting a gooseneck or fifth-wheel, to rear and surround views that improve awareness at slow speeds, the camera suite is like an extra set of eyes around your rig. Many drivers appreciate the way these views reduce guesswork when backing into tight spaces, aligning a trailer solo, or navigating crowded lots with a long wheelbase. Pair the camera tech with available driver-assistance features such as automated emergency braking, lane-departure warning, and automatic high-beam headlights to add peace of mind on busy commutes and highway hauls.

13.4-inch GMC Infotainment System with Google Built-in

Clarity, speed, and customization come together in the available 13.4-inch touchscreen with Google Built-in. Maps, voice assistance, and select apps integrate seamlessly, while wireless Apple CarPlay and Android Auto are supported across the lineup for quick pairing and a cord-free cabin. A 12.3-inch digital gauge cluster is available in many configurations, bringing crisp readouts for tow metrics, navigation prompts, and driver-assistance status. Audiophiles can elevate their cabin further with available Bose premium audio systems, while multiple USB ports and smart storage solutions keep devices charged and organized. It all adds up to a comfortable command center for long days behind the wheel.

MultiPro tailgate and integrated bed steps

Loading and working around the bed is more convenient with the MultiPro tailgate, now more widely available for 2026. It offers six functional positions for easier loading, access, and work support, including a helpful inner gate that doubles as a load stop or step. The Sierra HD also incorporates built-in steps aft of the cab doors and at the rear corners of the bumper, so you can access cargo from multiple angles with less strain. Add available box LED lighting and movable tie-downs, and the bed transforms into a versatile worksite, whether you are staging materials, securing a trailer, or packing for a weekend along the coast.