Conquer Any Terrain: The 2026 GMC Sierra AT4 and AT4X

The 2026 GMC Sierra 1500 AT4 and AT4X arrive ready to tackle the rugged Canadian landscape with purpose-built off-road capability. These full-size pickups combine proven power with advanced suspension technology, offering serious off-road credentials for drivers who demand more from their trucks. Whether navigating rocky trails or hauling equipment to remote job sites, the Sierra AT4 lineup delivers the capability needed for challenging terrain.

Both models feature 4WD Crew Cab configurations with factory-installed two-inch lifts and specialized off-road equipment. The AT4 provides accessible off-road performance with Rancho monotube shocks, while the AT4X elevates capability with Multimatic DSSV dampers and AEV-stamped steel bumpers. Standard power comes from the 3.0L Duramax Turbo-Diesel I6, with an available 6.2L EcoTec3 V8 for those seeking gasoline power.

AT4: Core Off-Road Capability

The Sierra 1500 AT4 establishes a strong foundation for off-road driving with its two-inch factory lift and off-road suspension package. Rancho monotube shocks provide improved damping control over rough terrain, while 20-inch polished aluminum wheels wear 275/60R20 all-terrain tires designed for mixed-surface traction. The two-speed Autotrac transfer case allows drivers to select appropriate power delivery for varying conditions.

Standard equipment includes underbody skid plates protecting vital components from trail debris and rocks. The MultiPro Tailgate offers six functional positions for loading, unloading, and worksite tasks. A spray-on bedliner with GMC logo comes standard, protecting the bed from scratches and impacts. The AT4 is available with either Short Bed or Standard Bed configurations, accommodating different cargo requirements.

AT4 Standard Features:

• 3.0L Duramax Turbo-Diesel I6 with ten-speed automatic transmission
• Two-inch factory lift with Rancho monotube shocks
• Two-speed Autotrac transfer case
• Jet Black interior with Kalahari accents and heated, ventilated perforated leather front seats

AT4X: Maximum Off-Road Performance

The Sierra 1500 AT4X takes off-road capability further with specialized equipment designed for extreme terrain. Multimatic DSSV (Dynamic Suspension Spool Valve) dampers replace the AT4's Rancho shocks, providing superior control and articulation over challenging obstacles. These dampers use advanced spool-valve technology to deliver consistent performance across varying speeds and surface conditions.

Front and rear electronic locking differentials come standard on AT4X, allowing drivers to maximize traction when one or more wheels lose grip. The AEV-stamped steel front bumper increases approach angle and includes winch capability for vehicle recovery. AEV hot-stamped boron steel skid plates offer enhanced protection compared to standard units. The AT4X rolls on 18-inch painted aluminum wheels with LT275/70R18 Goodyear Wrangler MT tires, prioritizing off-road grip and durability.

Inside, the AT4X features 16-way power heated and ventilated front seats with massage function, providing comfort during long drives to remote locations. The AEV Edition package is available for those seeking additional capability enhancements. The AT4X is available exclusively with Short Bed configuration, prioritizing maneuverability on tight trails.

Powertrain Options for Every Need

Both AT4 and AT4X models come standard with the 3.0L Duramax Turbo-Diesel I6 engine paired with a ten-speed automatic transmission featuring Electronic Precision shift. This diesel engine delivers strong torque output ideal for towing and hauling, while providing improved fuel efficiency compared to gasoline alternatives.

The available 6.2L EcoTec3 V8 engine provides an alternative for drivers preferring gasoline power. This V8 also pairs with the ten-speed automatic transmission, delivering strong acceleration and proven reliability. Both engines feature advanced engineering designed to handle the demands of off-road driving and heavy-duty work.

Interior Technology and Comfort

The Sierra AT4 models feature Jet Black interiors with Kalahari accent trim, creating a distinctive cabin environment. Heated and ventilated perforated leather front seats provide comfort across temperature extremes, from winter cold to summer heat. The available 15-inch diagonal multicolour Head-Up Display projects key driving information onto the windshield, allowing drivers to monitor vehicle data without looking away from the trail ahead.

The ten-speed automatic transmission's Electronic Precision shift provides precise gear selection for optimal performance. Technology integration supports off-road driving with systems designed to enhance capability across varying terrain conditions.

Comparing AT4 and AT4X Trims

Which Sierra AT4 Model Fits Your Needs?

The AT4 suits drivers seeking capable off-road performance with accessible pricing. Its Rancho shocks and standard equipment handle most trail conditions, while the available Standard Bed configuration accommodates longer cargo. This trim works well for recreational off-roading, light trail use, and work applications requiring occasional unpaved access.

The AT4X targets serious off-road enthusiasts and professionals requiring maximum capability. Multimatic DSSV dampers provide superior performance over extreme terrain, while front and rear locking differentials ensure traction in challenging situations. The AEV bumpers and skid plates offer enhanced protection for remote expeditions where vehicle damage could have serious consequences.

Your Next Adventure Starts Here

The 2026 GMC Sierra 1500 AT4 and AT4X deliver purpose-built capability for drivers who refuse to compromise on off-road performance. From the AT4's accessible capability to the AT4X's extreme terrain prowess, these trucks provide the tools needed to explore Newfoundland and Labrador's diverse landscape with confidence. Visit Woodward Motors Port Aux Basques Chevrolet to explore the Sierra AT4 lineup and schedule your test drive today.