New GMC Sierra 2500HDs for sale in Ajax, ON

2026 GMC Sierra 2500 HD Denali Ultimate – Glacier White Tricoat

Pure luxury meets heavy-duty power in the 2026 GMC Sierra 2500 HD Denali Ultimate. Finished in the striking Glacier White Tricoat, this flagship model represents the absolute highest expression of craftsmanship, technology, and strength that GMC offers. From its commanding stance to its meticulously appointed interior, Denali Ultimate stands in a class of its own.

Power comes from the legendary 6.6L Duramax Turbo-Diesel V8, delivering an incredible 470 hp and 975 lb-ft of torque paired with the proven 10-Speed Allison Automatic Transmission. Whether towing a fifth-wheel, hauling equipment, or commanding highway miles, this truck provides unmatched durability, torque delivery, and control.

Inside, the Denali Ultimate surrounds you with full-grain Alpine Umber leather, massaging seats, open-pore wood, premium stitching, and exclusive Denali Ultimate badging. A massive 13.4" GMC Premium Infotainment System with Google Built-In keeps you connected with wireless Apple CarPlay/Android Auto, customizable profiles, and enhanced navigation.

This model is equipped for serious capability with dual alternators, Snow Plow & Camper Package, Gooseneck/5th Wheel Prep Package, HD skid plates, and high-capacity cooling. Luxury meets practicality with a RealTruck hard-folding tonneau cover, all-weather liners, and advanced trailering technologies.

The 2026 Sierra Denali Ultimate is the ultimate combination of strength, refinement, and cutting-edge technology.

Key Features Include:

• 6.6L Duramax Turbo-Diesel V8 (470 hp / 975 lb-ft)

• 10-Speed Allison Automatic Transmission

• 11,350 lb GVWR

• 3.42 Rear Axle Ratio

• 20" Ultra-Bright Machined Aluminum Wheels

• LT275/65R20 All-Terrain Tires

• Alpine Umber Full-Grain Leather Interior

• 13.4" Premium GMC Infotainment w/ Google Built-In

• Snow Plow Prep / Camper Package

• Dual Alternators (220A & 170A)

• High Idle Switch

• Gooseneck / 5th Wheel Prep Package

• Skid Plates (Transfer Case & Oil Pan)

• Hard Folding RealTruck Advantage Tonneau Cover (LPO)

• All-Weather Floor Liners (LPO)

• Front License Plate Kit

• 3 Years SiriusXM Included

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Experience true heavy-duty luxury in person. Call us today at 905-427-2500 or visit Boyer Chevrolet Buick GMC Ajax, 425 Bayly Street West, Ajax, Ontario to see this 2026 Sierra Denali Ultimate for yourself.

2026 GMC Sierra 2500 HD AT4 Crew Cab – Sterling Metallic

The 2026 GMC Sierra 2500 HD AT4 delivers uncompromising off-road capability, premium refinement, and exceptional heavy-duty performance. Finished in Sterling Metallic and equipped with the iconic AT4 darkened exterior cues, this truck blends rugged design with advanced technology and diesel-powered strength.

Power comes from the legendary 6.6L Duramax Turbo-Diesel V8, producing a massive 470 hp and 975 lb-ft of torque—engineered for confident towing, hill climbing, and long-distance durability. Paired with the 10-Speed Allison Automatic Transmission, this Sierra provides smooth shifting, strong power management, and outstanding grade braking. Its 11,350 lb GVWR, 3.42 rear axle, and factory off-road suspension make it a perfect match for both jobsite demands and weekend adventures.

The AT4 cabin elevates capability with comfort. Jet Black leather with Kalahari accents, premium stitching, and exclusive AT4 detailing create a bold, upscale environment. A 13.4" GMC Premium Infotainment System with Google Built-In, wireless smartphone compatibility, and advanced connectivity keep every drive seamless and intuitive.

This truck is loaded with upgrades, including the AT4 Premium Plus Package, which bundles a power sunroof, advanced driver technology, and high-clearance off-road steps. Additional features like the Rear Camera Mirror, 15" Head-Up Display, dual alternators, Snow Plow Prep package, and fifth-wheel/gooseneck wiring provisions ensure you're ready for any task or terrain.

From deep backcountry trails to heavy towing days, the 2026 Sierra 2500 HD AT4 is built for those who want power, performance, and premium features in every mile.

Key Features Include:

• 6.6L Duramax Turbo-Diesel V8 (470 hp / 975 lb-ft)

• 10-Speed Allison Automatic Transmission

• 11,350 lb GVWR & 3.42 Rear Axle Ratio

• 20" High Gloss Black AT4 Aluminum Wheels

• LT275/65R20 All-Terrain Tires

• Jet Black Leather w/ Kalahari Accents

• 13.4" Premium Infotainment System w/ Google Built-In

• AT4 Premium Plus Package

• Technology Package (Rear Camera Mirror + 15" Head-Up Display)

• Snow Plow Prep / Camper Package

• Dual Alternators (220A + 170A)

• Fifth-Wheel/Gooseneck Trailer Wiring (UY2)

• Exhaust Brake

• Off-Road High Clearance Steps (LPO)

• Hard Folding RealTruck Advantage Tonneau Cover (LPO)

• Winter Grille Cover

• Smoked Amber Roof Marker Lamps

• All-Weather AT4 Floor Liners (LPO)

• Power Rear Sliding Window

• Universal Home Remote

• Rear Camera Mirror w/ Full Camera Display

• 3 Years SiriusXM Included