Heavy-duty capability meets utmost luxury and comfort within the class in the 2026 GMC Sierra HD lineup, featuring the new Sierra 2500 HD and Sierra 3500 HD models. Get work done efficiently with up to 36,000 pounds of towing power, a 6.6L Duramax engine with 975 lb-ft of torque, and many more features and great capabilities. Continue reading to learn more about the 2026 GMC Sierra HD models and which is the right choice for your line of work.
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Exterior
Bold Sophistication
In every detail, the 2026 GMC Sierra HD exudes a bold sense of ruggedness to match its heavy-duty capability. Notable features include a large grille with prominent “GMC” lettering, a wide stance that commands the road, and refined styling that blends seamlessly with modern accents.Exterior Paint Colours
Whether you are building the perfect hauling rig for your personal use or a business heavy-duty truck that’s ready for any task, you will have plenty of options when it comes to the exterior paint colour, including: (Extra Charge Colour*)- Summit White
- Onyx Black
- Cardinal Red
- Sterling Metallic
- Downpour Metallic*
- Titanium Rush Metallic*
- Coastal Dune*
- Glacier White Tricoat*
- Volcanic Red Tintcoat*
Interior
Spacious Cabins
Enjoy a spacious cabin for your crew or family drives in the 2026 GMC Sierra HD, which is available in Regular Cab, Double Cab, or Crew Cab configurations. Along with varying seating capacity and rear door sizes, the Crew Cab offers the most interior space, while the other two still have tons of room for everything riding along.Denali Ultimate
Choosing the Denali Ultimate trim when configuring your Sierra 2500 HD or 3500 HD brings a whole new dimension to what luxury can be inside a heavy-duty truck. A few of the many elegant additions of this exclusive trim include Alpine Umber interior with full-grain leather seating and available 16-way power front seats with a massaging feature, just to name a few.| Interior Dimensions | Front | Rear |
| Head Room | 1,093 mm (43.03 in) | 1,019 mm (40.12 in) |
| Leg Room | 1,131 mm (44.53 in) | 1,102 mm (43.40 in) |
| Shoulder Room | 1,677 mm (66.02 in) | 1,659 mm (65.30 in) |
| Hip Room | 1,554 mm (61.18 in) | 1,530 mm (60.24 in) |
| Cargo Volume | 1,968 L | |
Performance
6.6L Duramax Turbo-Diesel
The available 6.6L Duramax Turbo-Diesel engine in either the 2026 Sierra 2500 HD or 3500 HD pairs with a 10-speed automatic transmission to deliver an impressive 470 horsepower and 975 lb-ft of torque. This diesel engine provides a wide band of torque across the operating range, ensuring you have the strength needed for demanding hauling and trailering tasks throughout all of Ontario.Towing & Payload Capacities
The 2026 GMC Sierra 2500 HD offers a maximum towing capacity of up to 22,390 pounds, while the 3500 HD model extends this capability to 36,000 pounds. When it comes to hauling, the 2500 HD supports a maximum payload of 4,420 pounds, and the 3500 HD configuration provides an increased maximum payload capacity of up to 7,442 pounds.| Specifications: | 2026 GMC Sierra 2500 HD | 2026 GMC Sierra 3500 HD | ||
| Engine Type | 6.6L Gasoline V8 | 6.6L Duramax Turbo-Diesel | 6.6L Gasoline V8 | 6.6L Duramax Turbo-Diesel |
| Horsepower | 401 | 470 | 401 | 470 |
| Torque (lb-ft) | 464 | 975 | 464 | 975 |
| Max Towing Capacity | 22,390 | 36,000 | ||
| Max Payload Capacity | 4,420 | 7,442 | ||
| Transmission | 10-Speed Automatic | 10-Speed Automatic | ||
Technology
13.4-inch Premium GMC Infotainment
Add more technology to the cabin of the 2026 GMC Sierra HD with the available 13.4-inch touchscreen running GMC’s latest infotainment system, featuring intuitive menus and fast processing speeds for everyday use. Wireless Apple CarPlay and Android Auto also provide seamless connectivity, helping enhance every drive with greater functionality.ProGrade Trailering Tech
Take on your next towing trip with the outstanding capabilities of the 2026 GMC Sierra HD lineup, along with advanced technology that enhances the experience. From the In-Vehicle Trailering App to up to 14 available camera views, including a transparent trailer view, and Adaptive Cruise Control with trailering, your GMC truck offers a wide range of helpful features.
Safety & Driver Assistance
Pro Safety Features
For all-around protection, the 2026 GMC Sierra HD lineup comes equipped with tons of standard driver assistance features, including:- Forward Collision Alert
- Following Distance Indicator
- Front Pedestrian Braking
- Lane Departure Warning
- Automatic Emergency Braking
Front & Rear Park Assist
Keep your heavy-duty truck pristine by avoiding parking mishaps around the jobsite or campsite, where obstacles may be difficult to see from the driver’s seat. With the available Front and Rear Park Assist feature, your GMC will provide audible alerts when objects are detected around your Sierra HD, helping you brake in time to avoid a potential collision.2026 GMC Sierra HD FAQs
What’s the maximum towing capacity of the 2026 GMC Sierra 2500?
The 2026 GMC Sierra 2500 HD offers a maximum towing capacity of 22,390 lbs.
What’s the maximum towing capacity of the 2026 GMC Sierra 3500?
The 2026 GMC Sierra 3500 HD offers a maximum towing capacity of 36,000 lbs.
Which 2026 GMC Sierra HD models have the Duramax® engine?
Both the 2026 GMC Sierra 2500 HD and 3500 HD models are available with the 6.6L Duramax® Turbo-Diesel engine.
Which configuration of the 2026 GMC Sierra HD has the most payload?
The 2026 GMC Sierra 3500 HD provides the highest payload capacity, reaching up to 7,442 lbs.
2026 GMC Sierra HD Trim Levels
Pro
Starting at * $70,342
- 6.6L V8 Gas Engine with 10-Speed Automatic Transmission
- Trailering Package, Trailering Mirrors & Trailer Brake Controller
- 7-inch GMC Infotainment System
- Wireless Apple CarPlay® & Android Auto™
SLE
Starting at * $78,842
- 13.4-inch Premium GMC Infotainment System
- 12.3-inch Digital Driver Information Centre Display
- Traction Select System with Tow/Haul Mode
- 17-inch Machined Aluminum Wheels
SLT
Starting at * $93,242
- 10-Way Power Driver & Front Outboard Passenger Heated Seats
- Heated Steering Wheel
- ProGrade® Trailering System with In-Vehicle Trailering App
- 18-inch Machined Aluminum Wheels with Dark Grey Metallic Accents
AT4
Starting at * $101,942
- Exclusive Jet Black interior with Kalahari Accents
- Heated & Ventilated Perforated Front Leather Seating Surfaces
- 20-Inch Gloss-Black Aluminum Wheels
- Off-Road Suspension Package with Twin-Tube Rancho Shocks & Skid Plates
AT4X
Starting at * $118,142
- Factory-Installed 1.5-inch Suspension Lift with Multimatic DSSV Dampers
- Rear Electronic-Locking Differential
- 35-inch Multi-Terrain Tires
- Obsidian Rush Interior Featuring Full-Grain Leather Seating & Vanta Ash Wood
Denali
Starting at * $105,942
- 20-inch Ultra-Bright Machined Wheels with chrome Inserts
- Denali-Exclusive Authentic Wood & Patterned Aluminum Trim
- Forge Perforated Leather Seating Surfaces
- 12-Way Heated & Ventilated Power Front Seats
Denali Ultimate
Starting at * $131,042
- Duramax 6.6L Turbo-Diesel V8 Engine
- Signature Vader Chrome Grille
- Exclusive Alpine Umber Interior with Full-Grain Leather Seating
- 12-Speaker Bose Premium Series Audio System with Centerpoint Surround Sound
Shop the 2026 GMC Sierra 2500/3500 HD at Stratford Motor Products
Shop for the 2026 GMC Sierra 2500 HD or 3500 HD at Stratford Motor Products, your local GMC dealer with knowledgeable staff to help you configure your personal heavy-duty GMC truck or explore fleet options for your business. When it comes to driving a capable truck that’s also comfortable, a GMC is the go-to choice, especially when you opt for the Denali or Denali Ultimate trim levels. Contact us with any questions, or book your test drive today to experience the Duramax engine’s high torque firsthand.