Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6L Turbo-Diesel V8

When the assignment calls for maximum pulling power and high-mile confidence, the available Duramax 6.6L Turbo-Diesel V8 is the go-to choice. Rated at 470 hp and a commanding 975 lb-ft of torque, it teams with a 10-speed automatic to deliver smooth, decisive shifts under load. The broad torque plateau helps launch heavy trailers more consistently and hold speed on grades with less drama. Select configurations with this engine and a dual-rear-wheel axle unlock the Sierra 3500 HD’s highest conventional, fifth-wheel, and gooseneck ratings. An integrated exhaust brake helps manage downhill speeds, while available trailering profiles, trailer tire pressure monitoring, and a full camera suite reinforce confidence when the trailer gets long and the day runs late.

6.6L V8 Gas Engine

The standard 6.6L gas V8 produces 401 hp and 464 lb-ft of torque, matched to a 10-speed automatic that keeps the engine in its sweet spot whether you’re moving equipment between sites or navigating stop-and-go traffic with a loaded bed. For owners whose towing runs are moderate or intermittent, this engine delivers consistent performance and straightforward maintenance. The smooth calibration of the transmission helps reduce hunting on rolling terrain, and the powerband gives reassuring throttle response for merging and passing with work-grade payloads on board.

ProGrade Trailering System with 15 Camera Views

Confidence starts with visibility and repeatable setups. The Sierra HD offers a camera system with up to 15 available views to see around, behind, inside, and over your trailer. Transparent Trailer View can help you virtually “see through” a properly equipped trailer to monitor traffic behind you, while Hitch Guidance with Hitch View assists with lining up, connecting, and verifying a secure hookup. The in-vehicle Trailering App supports custom trailer profiles, light sequence tests, and available trailer tire pressure and temperature monitoring. Together, these tools simplify pre-trip checks, shorten departure times, and provide real-time information when conditions change on the road.

GMC MultiPro Tailgate

More than a party trick, the GMC MultiPro Tailgate’s six-position design makes daily loading and unloading faster and safer. Use the primary gate for standard access, deploy the full-width inner gate as a load stop for longer materials, or fold it down to create a convenient step for climbing into the box. The inner gate can also become a raised work surface for laptops and paperwork. Add available in-bed LED lighting, movable tie-downs, and a 120-volt outlet, and the Sierra 3500 HD’s cargo box transforms into a flexible mobile workstation. CornerStep rear bumper cutouts and bed-side steps ahead of the rear wheels further enhance access when you’re strapped for time or space.

13.4-inch GMC Infotainment System with Google Built-in

Clarity matters in demanding environments, which is why the available 13.4-inch touchscreen and 12.3-inch digital driver display are so impactful. The large, high-resolution interface supports Google Built-in for on-screen navigation, voice assistance, and compatible apps, reducing the need to juggle devices. Wireless Apple CarPlay and Android Auto keep your phone in play without the cable clutter, and available premium Bose audio brings clear, even sound to the cabin. Thoughtful touches—like a clear backup camera view, easy access to trailering functions, and redundant physical controls for essential tasks—make the system quick to learn and easy to use with work gloves.