2026 GMC Sierra 3500HD

The 2026 GMC Sierra 3500 Denali Ultimate 4WD represents the highest level of heavy-duty GMC capability and luxury. Finished in Downpour Metallic with a premium Alpine Umber interior, this Sierra is powered by the Duramax 6.6L V8 Turbo Diesel and paired with a 10-speed automatic transmission. With advanced towing technology, premium interior appointments, sophisticated safety systems, and the commanding presence of a Denali Ultimate, this truck is built for drivers who expect serious capability without sacrificing comfort or refinement.

Whether you're towing a fifth wheel, hauling equipment, heading to the cottage, navigating Ontario winters, or simply want one of the most capable and luxurious HD trucks available, this Sierra 3500 is exceptionally well equipped.

Duramax 6.6L Turbo Diesel Performance

At the heart of this Sierra 3500 Denali Ultimate is the legendary Duramax 6.6L V8 Turbo Diesel, matched with a 10-speed automatic transmission. This proven powertrain delivers the strength and torque required for serious towing and hauling while providing the smooth, confident driving experience expected from a premium GMC.

The 4WD system features a 2-speed active electronic AutoTrac transfer case, providing selectable capability for changing road and terrain conditions. An automatic locking rear differential, Digital Variable Steering, and StabiliTrak with Trailer Sway Control and Hill Start Assist further enhance control.

This Sierra is equipped with a 3.42 rear axle ratio and a substantial 5,557 kg (12,250 lb) GVWR, providing the heavy-duty foundation needed for demanding work and recreational applications.

Maximum Towing Confidence

This truck is equipped with the Gooseneck/5th Wheel Prep Package, making it ready for serious trailer applications. The integrated Trailer Brake Controller works alongside Hitch Guidance and Hitch View to make trailer connection and positioning easier.

The In-Vehicle Trailering App provides useful trailer information and monitoring capabilities, while the HD Surround Vision system helps provide enhanced visibility around the truck.

Trailer Side Blind Zone Alert and Rear Cross Traffic Alert provide additional awareness when changing lanes or reversing with a trailer, while Front and Rear Park Assist helps make manoeuvring this large HD pickup easier.

Denali Ultimate Interior

Step inside and the Sierra 3500 Denali Ultimate immediately feels different from an ordinary work truck. The Alpine Umber interior creates a sophisticated and upscale environment, complemented by premium materials and extensive comfort features.

The 16-way power driver seat provides extensive adjustability, while heated and ventilated front seats and heated second-row outboard seats provide comfort during both hot summers and cold Canadian winters.

The heated leather-wrapped steering wheel, driver seat and mirror memory, dual-zone automatic climate control, power-sliding rear window, universal home remote, and wireless charging add convenience throughout the cabin.

A Bose Premium Series 12-speaker audio system provides high-quality sound, while the 12.3-inch reconfigurable Driver Information Centre keeps important vehicle information clearly displayed.

Advanced GMC Technology

The Sierra features GMC's Premium Infotainment System with a large 13.4-inch diagonal colour touchscreen and Google Built-In compatibility. Navigation capability, Bluetooth connectivity, wireless Apple CarPlay and wireless Android Auto keep you connected wherever the road takes you.

The 15-inch multicolour Head-Up Display projects important driving information directly into the driver's field of view, helping reduce the need to look away from the road.

The Rear Camera Mirror provides an enhanced rearward view, while the Bed View Camera adds useful visibility when monitoring cargo or connecting a trailer.

Wireless charging keeps compatible devices powered without the need for additional cables, while SiriusXM provides additional entertainment options.

Sierra HD Pro Safety

GMC has equipped this Sierra with a comprehensive collection of advanced safety and driver-assistance technologies.

Sierra HD Pro Safety includes Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, Driver Safety Alert Seat, HD Surround Vision, Front and Rear Park Assist, Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Following Distance Indicator, and IntelliBeam automatic high beams.

Adaptive Cruise Control provides additional convenience during highway driving, while Trailer Sway Control helps provide additional confidence when towing.

Premium Denali Exterior

The Downpour Metallic exterior gives this Sierra 3500 a distinctive and sophisticated appearance. The Denali Ultimate styling is complemented by 20-inch Ultra Bright Machined Aluminum wheels with black inserts, creating a premium look while maintaining the rugged presence expected from a Sierra HD.

Power-retractable assist steps with LED perimeter lighting provide convenient access to the cabin and automatically tuck away when not required.

The exterior is further equipped with animated LED projector headlamps, front LED fog lamps, LED cargo bed lighting, rain-sensing wipers, and power-adjustable, heated, auto-dimming mirrors with integrated turn signals, power folding, power extending, and perimeter lighting.

The factory spray-on bed liner provides durable protection for the cargo box, while the GMC MultiPro Tailgate adds versatility when loading and unloading.

Built for Work and Recreation

This Sierra 3500 Denali Ultimate includes equipment designed for more than just towing. The Snow Plow Prep/Camper Package adds versatility for demanding Canadian conditions and recreational use, while the High Idle Switch provides additional functionality for specific work applications.

The factory Gooseneck/5th Wheel Prep Package provides a strong foundation for fifth-wheel and gooseneck trailers, making this Sierra particularly appealing to RV owners, contractors, farmers, tradespeople, and anyone requiring substantial towing capability.

Floor liners with removable carpet inserts help protect the interior while providing flexibility for different driving conditions.

The Ultimate Sierra HD Experience

The 2026 GMC Sierra 3500 Denali Ultimate brings together Duramax diesel power, 4WD capability, serious towing equipment, advanced trailering technology, premium Denali Ultimate appointments, and sophisticated driver-assistance technology.

Finished in Downpour Metallic with an Alpine Umber interior, this is a Sierra designed for someone who wants maximum capability without giving up luxury.

From its Duramax 6.6L V8 Turbo Diesel and Gooseneck/5th Wheel Prep Package to its 15-inch Head-Up Display, Bose 12-speaker audio system, heated and ventilated seating, power-retractable assist steps, HD Surround Vision, and premium Denali Ultimate styling, this Sierra 3500 is equipped to handle the biggest jobs while making every drive more comfortable.

Key Features & Highlights

2026 GMC Sierra 3500 Denali Ultimate 4WD, Downpour Metallic, Alpine Umber Interior, Duramax 6.6L V8 Turbo Diesel, 10-Speed Automatic Transmission, 2-Speed AutoTrac Transfer Case, 3.42 Rear Axle Ratio, 12,250 lb GVWR, Gooseneck/5th Wheel Prep Package, Snow Plow Prep/Camper Package, Trailer Brake Controller, Hitch Guidance, Hitch View, In-Vehicle Trailering App, HD Surround Vision, Bed View Camera, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, Front and Rear Park Assist, Adaptive Cruise Control, 15-Inch Multicolour Head-Up Display, Rear Camera Mirror, 13.4-Inch GMC Infotainment System, Google Built-In, Navigation Capability, Wireless Apple CarPlay, Wireless Android Auto, Bose Premium Series 12-Speaker Audio, 16-Way Power Driver Seat, Heated and Ventilated Front Seats, Heated Second-Row Seats, Heated Leather-Wrapped Steering Wheel, Wireless Charging, Power Sliding Rear Window, Power-Retractable Assist Steps, 20-Inch Machined Aluminum Wheels with Black Inserts, Spray-On Bed Liner, Animated LED Projector Headlamps, LED Fog Lamps, Rain-Sensing Wipers, GMC MultiPro Tailgate, High Idle Switch, Floor Liners