2026 GMC Sierra 2500 At4x 

in Vernon, near Kelowna 

2026 GMC Sierra 2500HD AT4X Crew Cab 4x4 | 6.6L Duramax | 5th Wheel Prep | Coastal Dune | Obsidian RushExtreme off-road capability, serious Duramax diesel power, and premium luxury come together in this 2026 GMC Sierra 2500HD AT4X Crew Cab 4x4 Standard Box. Finished in distinctive Coastal Dune with an upscale Obsidian Rush full-grain leather interior, the AT4X sits at the top of GMC's off-road-focused Sierra HD lineup.Power comes from the 6.6L Duramax Turbo-Diesel V8, producing an impressive 470 horsepower and 975 lb-ft of torque, paired with a 10-speed automatic transmission. This truck is also equipped with the Gooseneck/5th Wheel Prep Package, Exhaust Brake, High Idle Switch, and Engine Block Heater.For someone who wants a premium heavy-duty diesel that can tow, work, travel, and tackle serious terrain, the AT4X delivers an exceptional combination.6.6L Duramax Turbo-Diesel | 470 HP & 975 LB-FTThe legendary 6.6L Duramax Turbo-Diesel V8 (L5P) delivers:470 horsepower | 975 lb-ft of torqueThat massive torque output gives the Sierra 2500HD the muscle needed for demanding trailers, steep grades, and heavy loads while remaining remarkably refined on the highway.The Duramax is also B20 biodiesel compatible and is paired with a sophisticated 10-speed automatic transmission for excellent power delivery across a wide range of driving conditions.AT4X ? GMC's Ultimate HD Off-Road TruckThe AT4X takes the already capable Sierra HD AT4 and pushes its off-road hardware significantly further.Key AT4X capability includes equipment such as:Multimatic DSSV? dampersFront electronic locking differentialRear electronic locking differentialSpecialized off-road suspensionIncreased ground clearanceSteel transfer-case skid plateAdditional underbody protectionOff-road-focused tiresTerrain ModeHill Descent ControlThe combination of specialized suspension and front and rear locking differentials gives the AT4X serious capability when traction and terrain become challenging.Whether you're travelling lease roads, accessing remote property, heading into the backcountry, or dealing with deep snow, this is far more than an appearance package.Gooseneck / 5th Wheel Prep Package (Z6A)This Sierra is factory equipped with the Gooseneck/5th Wheel Prep Package, providing an integrated hitch platform designed to accept a compatible gooseneck or fifth-wheel hitch.It's a highly desirable option for owners planning to tow:Fifth-wheel RVsGooseneck equipment trailersHorse and livestock trailersCommercial trailersRecreational trailersActual towing capacity varies based on the truck's exact configuration, trailer, hitch, passengers, cargo, and equipment, so the vehicle's trailering label should be used to confirm its specific ratings.Exhaust Brake (K40)The factory Diesel Exhaust Brake is especially valuable when towing through rolling or mountainous terrain.It uses the diesel powertrain to help control vehicle speed on descents, reducing reliance on the service brakes and giving the driver additional confidence when managing a heavy trailer.Obsidian Rush Full-Grain LeatherInside, the AT4X is every bit as impressive as its capability suggests.The exclusive Obsidian Rush interior with full-grain leather seating creates a cabin that feels much closer to a premium luxury vehicle than a traditional heavy-duty work truck.Premium comfort includes features such as:Full-grain leather seatingHeated and ventilated front seatsHeated rear outboard seatsHeated steering wheelPower-adjustable front seatingDriver memoryDual-zone automatic climate controlPremium interior materialsSpacious Crew Cab rear seatingIt's designed for drivers who may spend hours behind the wheel travelling between jobs, towing an RV, or crossing the province.Premium TechnologyThe Sierra HD AT4X combines its traditional heavy-duty capability with modern GMC technology.Highlights include:13.4-inch GMC Premium Infotainment touchscreenGoogle built-in compatibilityGoogle Maps and Google Assistant integrationWireless Apple CarPlay®Wireless Android Auto?12.3-inch digital Driver Information Centre15-inch multicolour Head-Up DisplayBose® premium audioAdvanced camera technologyWireless device chargingThe large digital displays and available camera views are particularly useful when maneuvering a heavy-duty pickup or working around a trailer.High Idle Switch (UF3)The factory High Idle Switch is a valuable addition for certain stationary, commercial, and cold-weather operating situations.It's especially useful for owners who intend to put their Duramax to work rather than simply use it as a daily driver.Engine Block Heater (K05)A factory Engine Block Heater is an important feature for a diesel truck operating through Canadian winters, helping with cold-weather starting and warm-up during extreme temperatures.Combined with four-wheel drive, heated seating, heated steering wheel, and Remote Start capability, this Sierra is well prepared for winter.Coastal Dune ExteriorThe Coastal Dune finish gives this AT4X a distinctive appearance that complements its rugged exterior design.AT4X-specific styling, aggressive off-road stance, premium exterior details, and the unique colour combination make this truck immediately stand out from a conventional Sierra HD.Why Buy This 2026 Sierra 2500HD AT4X?This truck combines some of the most desirable equipment available in a heavy-duty GMC:6.6L Duramax Turbo-Diesel470 horsepower975 lb-ft of torque10-speed automatic transmission4-Wheel DriveMultimatic DSSV dampersFront & rear electronic locking differentialsAT4X off-road suspensionGooseneck/5th Wheel Prep PackageDiesel Exhaust BrakeHigh Idle SwitchEngine Block HeaterObsidian Rush full-grain leatherCoastal Dune exteriorPremium GMC technologyThe biggest advantage of the AT4X is its versatility. It's a luxury truck, serious tow vehicle, heavy-duty workhorse, and highly capable off-road pickup all in one package.For someone who wants Duramax capability without compromising on comfort or off-road hardware, this 2026 GMC Sierra 2500HD AT4X is about as complete as a heavy-duty pickup gets.