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 2500HD Denali Crew Cab 4x4

Unrivaled Power. Refined Luxury. Professional Grade.

The 2026 GMC Sierra 2500HD Denali Crew Cab 4x4 sets the standard for heavy-duty performance and first-class comfort. Finished in bold Downpour Metallic, this truck blends the brute strength of a diesel powerhouse with the premium craftsmanship and advanced technology that define the Denali name.

Unstoppable Duramax™ Diesel Power

Under the hood, the legendary 6.6L Duramax Turbo-Diesel V8 (L5P) delivers 470 horsepower and an incredible 975 lb-ft of torque, providing unmatched towing and hauling capability. Paired with an advanced 10-speed Allison® automatic transmission (MGM), the Sierra 2500 Denali offers smooth shifting, precise power delivery, and exceptional control — whether towing, off-roading, or cruising the highway.

The Exhaust Brake (K40) and Engine Block Heater (K05) ensure dependable performance and control in every condition, while the 3.42 rear axle ratio (GU6) and GVWR of 11,350 lbs (JGL) reinforce this truck’s heavy-duty capability.

Denali Design and Presence

The Downpour Metallic exterior turns heads with 20" Ultra-Bright Machined Aluminum Wheels (Q7F), All-Terrain Blackwall tires (QF9), and Power-Retractable Assist Steps (BRS) with LED perimeter lighting. From its signature Denali grille to chrome accents and sculpted lines, this Sierra projects confidence, capability, and luxury from every angle.

Luxury Meets Functionality

Inside, the Atmosphere/Brownstone Forge perforated leather seats (H24) surround you in craftsmanship and comfort. Heated and ventilated front bucket seats (A50) with a centre console, premium materials, and advanced ergonomics make every drive first-class.

The Technology Package (CWM) adds a 15" Multicolour Head-Up Display (UV6) and Rear Camera Mirror (DRZ), keeping key information right where you need it. A power sunroof (CF5) opens the cabin to natural light, creating a truly elevated driving experience.

Advanced Connectivity & Technology

The 13.4" Premium GMC Infotainment System (IOK) with Google built-in delivers full connectivity, featuring wireless Apple CarPlay®, Android Auto™, navigation, voice assistance, and Bluetooth® audio streaming. Personalize your drive with multiple user profiles, seamless smartphone integration, and access to your favourite apps.

The Bose® Premium Audio System fills the cabin with concert-quality sound, making every trip an experience in itself.

Ready for Every Towing Task

With the Trailering Wiring Provisions (UY2), Trailer Tire Pressure Monitor Sensors (PTT), and In-Vehicle Trailering App (UET) compatibility, the Sierra Denali is engineered to handle even the most demanding towing jobs. The Exhaust Brake, Hill Descent Control, and Advanced Trailering System provide complete control and confidence on any grade.

Key Highlights

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

• 10-Speed Allison® Automatic Transmission

• Downpour Metallic Exterior

• Atmosphere/Brownstone Forge Leather Interior

• 20" Ultra-Bright Machined Aluminum Wheels

• Power Sunroof

• 15" Multicolour Head-Up Display & Rear Camera Mirror

• Power-Retractable Assist Steps with LED Lighting

• Advanced Trailering & Exhaust Brake System

• Bose® Premium Audio & 13.4" GMC Infotainment System with Google Built-In

Luxury and Power in Perfect Balance

From heavy-duty capability to refined Denali craftsmanship, the 2026 GMC Sierra 2500HD Denali Crew Cab 4x4 is the ultimate expression of strength, sophistication, and technology. Whether you’re towing with confidence or cruising in comfort, this Denali does it all — in true Professional Grade style.

Now Available at Boyer Chevrolet Buick GMC Ajax 425 Bayly Street West, Ajax, Ontario 905-427-2500

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

• 6.6L V8 gas, 3.73 rear axle, 4WD w/ 2-speed Autotrac

• Heavy-duty cooling, battery 720 CCA, alternator 170A

• Trailer brake controller, trailering app, hitch guidance, bed view camera

• Off-road suspension, front recovery hooks, skid plates

• 4-wheel disc brakes w/ DURALIFE rotors, capless fuel fill

• StabiliTrak, airbags, park assist, rear cross traffic alert, teen driver

• 12/12-way power seats, heated rear seats, 60/40 rear bench w/ storage

• 12.3” driver display, 13.4” infotainment screen, dual-zone climate, wireless charging

• LED fog lamps, LED cargo lighting, MultiPro tailgate, body-color bumpers w/ steps

• Chrome grille & mirror caps, trailering mirrors, deep-tinted glass, optional polished exhaust tip

• Duramax 6.6L Turbo-Diesel V8 – 470 hp / 975 lb-ft torque

• 4WD with AutoTrac 2-speed transfer case & auto-locking rear diff

• Heavy-duty trailering: integrated brake controller, exhaust brake, in-vehicle trailering app

• GVWR 11,350 lbs – built for serious towing & hauling

• Off-road suspension, skid plates & hill descent control

• Advanced safety tech: front & rear park assist, trailer blind zone alert, rear cross-traffic alert

• Denali Ultimate styling with signature grille & LED lighting

• MultiPro Tailgate with six load/access functions

• Premium interior: heated steering wheel, digital cluster, 13.4” touchscreen

• Wireless charging, adaptive cruise control & remote start

• 6.6L V8 Gas Engine • 4×4 w/ 2-Speed Autotrac Transfer Case & Hill Descent Control

• Off-Road Suspension + Skid Plates + Red Tow Hooks + Heavy-Duty Cooling System

• 13.4” Touchscreen + 12.3” Digital Cluster • Heated Front & Rear Seats • Heated Steering Wheel

• Adaptive Cruise • Wireless Charging • Dual-Zone Climate • Remote Start

• MultiPro Tailgate • Spray-On Bedliner • 120V Interior & Bed Power Outlets

• Trailering Tech: Integrated Brake Controller • Bed View Camera • Hitch Guidance

• Safety Suite: Front & Rear Park Assist • Rear Cross Traffic Alert • Blind Zone Alert • Safety Alert Seat

• LED Headlamps & Fog Lamps • Animated LED Tail Lamps • Gloss Black Grille Accents

• Apple CarPlay & Android Auto Compatibility

• 6.6L V8 Gas Engine • 4x4 with 2-Speed Autotrac • Off-Road Suspension & Skid Plates • Hill Descent Control

• 13.4” Touchscreen + 12.3” Digital Cluster • Heated & Power Front Seats • Heated Rear Seats • Wireless Charging • Dual-Zone Climate

• Factory Red Tow Hooks • MultiPro Tailgate • LED Headlights, Fog & Animated Taillamps • Rain-Sensing Wipers

• Trailering Tech Suite: In-Vehicle Trailering App • Trailer Side Blind Zone Alert • Bed View & Hitch Cameras • Integrated Brake Controller

• Advanced Safety: Adaptive Cruise • Front & Rear Park Assist • Rear Cross Traffic Alert • Teen Driver Mode

• Apple CarPlay & Android Auto Compatible

• 6.6L V8 Gas – 401 HP / 464 lb-ft Torque

• Heavy-Duty 4WD w/ 2-Speed Transfer Case & Auto-Locking Rear Diff

• Integrated Trailer Brake Controller + Hitch Guidance

• Fully-Boxed HD Frame w/ Heavy-Duty Cooling

• 12.3” Digital Driver Display + 13.4” Touchscreen

• Chrome Bumpers, CornerStep & LED Signature Taillamps

• Capless Fuel Fill + High-Capacity Electrical System

• 6.6L V8 HD Platform w/ 4WD

• 10,450-lb GVWR Heavy-Duty Capability

• 3.73 Rear Axle + Auto-Locking Differential

• Integrated Trailer Brake Controller

• External Engine & Transmission Oil Coolers

• Fully-Boxed HD Frame

• 12.3” Digital Driver Display + 13.4” Touchscreen

• Pro Safety Suite w/ Hitch Guidance

• 120V Power Outlets (Cab & Bed)

• Chrome HD Exterior w/ EZ-Lift Power-Lock Tailgate

• Kms to be determined after demo period

• 4x4 with 2-speed Autotrac transfer case, auto-locking rear diff, Hill Descent Control

• Heavy-duty cooling, engine/trans oil coolers, HD air filter, 720 CCA battery, 170A alternator

• Integrated trailer brake controller, In-Vehicle Trailering App, Trailer Side Blind Zone Alert

• Hitch Guidance, trailer camera provisions, Bed View Camera, trailering rating label

• Off-Road suspension with twin-tube shocks, skid plates, Duralife 4-wheel discs

• StabiliTrak with trailer sway control & hill start assist, full airbag coverage, Safety Alert Seat

• Rear Cross Traffic Alert, Park Assist (front/rear), Following Distance Indicator

• 60/40 rear bench with storage, heated 2nd-row outboard seats, 12-way power driver/passenger seats

• Memory driver settings, heated wrapped wheel, large center console, dual-zone climate

• 12.3” digital cluster + 13.4” touchscreen, wireless charging, remote start, Adaptive Cruise

• 120V outlets (cab & bed), rear USB charge ports, rear air vents

• Chrome recovery hooks, skid plates, fully-boxed frame

• 18” spare, wheelhouse liners, cargo tie-downs (12), CornerSteps + BedSteps

• LED fog lamps, animated LED tail lamps, roof marker lamps, LED bed lighting

• Power-extending heated trailering mirrors with perimeter/aux lighting

• Chrome grille, chrome handles, deep-tint glass, rain-sensing wipers

• MultiPro Tailgate with power lock/release, bed rail caps, polished exhaust tip

• 6.6L gas V8–ready hardware (HD battery, HD alternator, HD air filter)

• AutoTrac 4×4 with hill descent, auto-locking rear diff & skid plates

• Off-road suspension with twin-tube shocks

• Fully boxed frame & Duralife 4-wheel discs

• Digital Variable Steering Assist

• Integrated trailer brake controller + Trailering App

• Bed View Camera + Trailer Camera Provisions

• Hitch Guidance & Trailer Side Blind Zone Alert

• Rear Cross-Traffic Alert & Safety Alert Seat

• Front & Rear Park Assist

• Heated front & rear outboard seats

• Driver memory & 10-way power seats (driver/passenger)

• Large 13.4” GMC touchscreen + 12.3” digital cluster

• Wireless charging + remote start

• Adaptive Cruise Control

• Dual-zone climate & rear vents

• Up-level rear bench with under-seat & seatback storage

• MultiPro Tailgate + 12 fixed cargo tie-downs

• Rain-sensing wipers & deep-tint glass

• LED fog lamps + animated LED tail lamps

• Power-folding/extending trailering mirrors with perimeter lighting

• Body-color bumpers, Black grille & wheelhouse liners