What Is the 2026 GMC Sierra 1500 AT4? The 2026 GMC Sierra 1500 AT4 is a premium off-road truck. It comes standard with: Crew Cab Four-wheel drive 3.0L Duramax turbo-diesel Two-inch factory lift Rancho monotube shocks Skid plates All-terrain tires Premium interior Advanced trailering technology The AT4 adds off-road equipment without giving up daily comfort. 2026 Sierra AT4 Engine Options Engine Horsepower Torque Transmission 3.0L Duramax diesel 305 hp 495 lb.-ft. 10-speed automatic Available 6.2L V8 420 hp 460 lb.-ft. 10-speed automatic Standard Duramax Diesel The 3.0L Duramax turbo-diesel is standard. It produces: 305 horsepower 495 lb.-ft. of torque It is paired with a 10-speed automatic transmission and Electronic Precision Shift. Available 6.2L V8 A 6.2L V8 is also available. It produces: 420 horsepower 460 lb.-ft. of torque Check the window sticker to confirm which engine is installed. What Comes Standard on the Sierra AT4? The AT4 builds on the Sierra SLT. It adds off-road equipment, premium comfort and trailering technology. Standard Off-Road Equipment Four-wheel drive AutoTrac two-speed transfer case Two-inch factory suspension lift Rancho monotube shocks Hill Descent Control Skid plates Heavy-duty air filter Engine block heater 20-inch all-terrain tires Red front recovery hooks The lifted suspension gives the AT4 more ground clearance than a standard Sierra. Important: Recovery hooks must never be used to tow another vehicle. AT4 Exterior Features The AT4 has a darker and more rugged appearance. Standard exterior equipment includes: High-gloss black grille details Body-color front and rear bumpers Body-color door handles High-gloss black mirror caps 20-inch machined-aluminum wheels All-terrain tires Red recovery hooks Dual-outlet exhaust Rear CornerStep bumper Spray-on bedliner with GMC logo GMC MultiPro tailgate LED cargo-bed lighting 12 cargo tie-downs Bed-mounted 120-volt power outlet Crew Cab Interior The 2026 Sierra 1500 AT4 is offered as a Crew Cab. Standard interior features include: Front bucket seats Center console Heated front seats Ventilated front seats Heated rear outboard seats Heated steering wheel Power driver and front-passenger seats Power lumbar support Driver-seat and mirror memory Power rake-and-telescoping steering column Dual-zone automatic climate control Premium front and rear floor liners Folding rear bench Rear-seat storage system Remote start Keyless Open and Start Infotainment and Technology The Sierra AT4 includes two large dashboard displays. Standard Technology 13.4-inch Premium GMC Infotainment System 12.3-inch digital Driver Information Center Google built-in compatibility Wireless Apple CarPlay Wireless Android Auto Wireless phone charging Bose seven-speaker premium audio system Advanced voice recognition Personalized driver profiles Multiple USB ports Google built-in services are subject to plan requirements and other limitations. Standard Trailering Technology The Sierra AT4 includes the ProGrade Trailering System. Its features include: Hitch View In-vehicle trailering app Smart Trailer Integration Indicator The AT4 also includes: Trailer brake controller Trailer Camera Provisions Trailer Side Blind Zone Alert 120-volt bed-mounted power outlet Additional trailering cameras and mirrors are available. Standard Safety Features Every Sierra AT4 includes GMC Pro Safety. GMC Pro Safety Automatic Emergency Braking Following Distance Indicator Forward Collision Alert Front Pedestrian Braking IntelliBeam automatic high beams Lane Keep Assist Lane Departure Warning Sierra Safety Plus The AT4 also includes Sierra Safety Plus: Front and Rear Park Assist HD Surround Vision Rear Cross Traffic Braking Rear Pedestrian Alert Safety Alert Seat Trailer Camera Provisions Trailer Side Blind Zone Alert Adaptive Cruise Control is also standard. Safety systems assist the driver. They do not replace careful driving. Available Sierra AT4 Packages AT4 Preferred Package The AT4 Preferred Package adds: Power rear-sliding window Universal Home Remote Technology Package The Technology Package adds: 15-inch Head-Up Display Bed View Camera Rear Camera Mirror AT4 Premium Package The AT4 Premium Package includes: AT4 Preferred Package AT4 high-clearance steps AT4 CarbonPro Edition The AT4 CarbonPro Edition requires the AT4 Premium Package. It includes: CarbonPro carbon-fiber composite bed MultiPro Audio System by KICKER CarbonPro exterior badging The CarbonPro bed replaces the standard bed and spray-on bedliner configuration. Other Available AT4 Equipment Available equipment includes: 6.2L V8 Power sunroof Power rear-sliding window Rear Camera Mirror Head-Up Display Bed View Camera Vertical trailering mirrors Trailer Tire Pressure Monitor Sensors Auxiliary Trailer Camera 18-inch wheels Mud-terrain tires High-clearance steps Rocker guards Sport bar Off-road recovery kit CarbonPro bed Equipment may require certain packages or other options. Who Should Consider the Sierra AT4? The Sierra 1500 AT4 may fit buyers who want: Standard four-wheel drive A diesel engine A factory suspension lift Off-road equipment Crew Cab space Heated and ventilated seats Advanced trailering technology Large interior displays Premium comfort A rugged design with fewer chrome details Frequently Asked Questions What engine comes standard in the 2026 Sierra AT4? The 3.0L Duramax turbo-diesel is standard. It produces 305 horsepower and 495 lb.-ft. of torque. Is the Sierra AT4 four-wheel drive? Yes. Four-wheel drive is standard. Does the Sierra AT4 have a factory lift? Yes. The AT4 has a standard two-inch factory suspension lift with Rancho monotube shocks. Is the Sierra AT4 available as a Crew Cab? Yes. The 2026 Sierra 1500 AT4 is offered as a Crew Cab. Does the Sierra AT4 have leather seats? The AT4 has a premium interior with front bucket seats. Review the window sticker for the exact seat material and interior configuration. Are ventilated seats standard? Yes. Heated and ventilated front seats are standard. Heated rear outboard seats are also standard. Does the Sierra AT4 have the MultiPro tailgate? Yes. The GMC MultiPro tailgate is standard on the AT4. Does the Sierra AT4 have Adaptive Cruise Control? Yes. Adaptive Cruise Control is standard. Does the Sierra AT4 have a Head-Up Display? The 15-inch Head-Up Display is available through the Technology Package. Shop the 2026 GMC Sierra 1500 AT4 in St. Louis Browse our current Sierra 1500 AT4 inventory to compare engines, colors and packages. Always check the window sticker. Standard and available equipment can vary by vehicle.