2024 GMC Sierra 2500HD AT4X: Price, Release Date & Specs

2024 GMC Sierra 2500HD AT4X: Price, Release Date & SpecsThe logical follow-up question to the announcement of the Chevrolet Silverado ZR2 for 2024 is: what about GMC? What will the GMC version look like? Thankfully, yes. The GMC HD is a descendant of the Sierra 1500 AT4X, just as the Chevy HD followed in its footsteps.

2024 GMC Sierra 2500HD AT4X
2024 GMC Sierra 2500HD AT4X


2024 GMC Sierra 2500HD AT4X, and especially its top-of-the-line AEV Edition takes the stifled off-road AT4 to a new level (if there is such a thing as an HD truck). This is a big truck that will take on the Ram Power Wagon and Ram 2500 HD Rebel as well as Ford Super Duty Tremor, all of which are heavy-duty off-road trucks weighing three-quarters tons.

The Sierra 2500HD at4x is mechanically similar to the Silverado 2500HD ZR2 and features a MultiMatic dynamic suspension spool valve (DSSV), paired with a 1.5-inch lift in the suspension for greater ground clearance. The suspension modifications are completed by “Specific’ upper and lower control arms and steering knuckles. The front skidplate is made of aluminum, and the underbody skidplate for transfer case steel protects vital parts while off-road. Approach/break over/departure angles for the AT4X come in at 31.6/25.7/21.2 degrees.

The rig rides on aggressive Goodyear Wrangler Territories MT tires, which are basically 35-inch tires (actually 34.8-inch) mounted on 18-inch wheels. The HD Sierra has a locking rear differential, but not a locking front differential. This is because the larger HD Sierra would destroy the locking differential. The new Off-Road Mode allows you to adjust things such as the anti-lock breaks, transmission, throttle, and traction control for a more aggressive off-road driving experience.

Exclusive Obsidian Rush Interior of 2024 GMC Sierra 2500HD At4X offers optimal protection from the elements. It features power-massaging seats in the front, leather seats wrapped throughout the interior, Vanta Ash decor, and Bose Premium Series Audio System with Centerpoint Surround Technology. The interior features a 13.4-inch touchscreen infotainment system, a 12.3-inch driver information center, and a 15-inch display.

The GMC Sierra HD AT4X, which is only available as a standard 2500HD Crew Cab Standard Bed with four-wheel-drive, comes powered either by a 6.6 liter V-8 gasoline (401 horsepower/464 lb.-ft. of torque), or by the Duramax turbodiesel 6.6 liters (470 hp/975 lb.-ft.), both supported by a 10-speed Allison automatic transmission.

AT4X diesel, which is the heaviest AT4X model, has a weight of 8,605 pounds. The AT4X gasoline, on the other hand, can carry a payload of up to 3,291 lbs. Maximum traditional towing comes in at 18,500 pounds (AT4X diesel), and fifth-wheel/gooseneck towing is at 18,000 pounds (AT4X gas). There are many trailering technologies and assistive features: Transparent Trailer view, Trailer Side blind zone alert, Adaptive cruise control with Trailering, and 14 camera views.

AT4X AEV Edition is the GMC name for the Silverado 2500HD ZR2 Bison special edition (co-developed by American Expedition Vehicles or AEV). The AEV stamped-steel bumpers on this alpha AT4X have integrated winch points, and the front bumper has a recovery point. Heavy-duty skid plates protect the engine and transfer case. The Sierra HD AT4X AEV edition is rounded out by sleek 18-inch AEV Salta rims, distinctive exterior badges, AEV logoed headrests for the front seats, and AEV branded floor liners. The Sierra HD AT4X AEV Edition will be offered in both gas and diesel.

The 2024 GMC Sierra HD AT4X will be available in dealerships by the end of the summer of 2023. This is after the Silverado HD ZR2 arrives. The AEV Edition’s price hasn’t been revealed, but we can guess that it will be higher than the HD Denali Ultimate, which is $94,000. We’d bet on the Sierra HD AT4X to become Overland Expo’s “Next Ultimate Overland Vehicle”.

2024 GMC Sierra 2500HD AT4X Design
2024 GMC Sierra 2500HD AT4X Design


The AT4X badge was first introduced in the Sierra 1500 model of 2022. The regular AT4 was previously the top-of-the-line off-road pickup option, available on the 3500HD as well as the 2500HD. AT4X can only be ordered on 2500HDs with crew-cab bodies and standard-length cargo beds.

The 2024 GMC Sierra 2500HD AT4X has a similar appearance to the 2024 Chevy 2500HD ZR2. The two trucks share the same black 18-inch wheels with 35-inch Goodyear Wrangler Territories M/T rubber. Multimatic DSSV spool valve dampers are used to support the AT4X truck’s raised suspension by 1.5 inches. These fancy shocks are also found in professional race cars, and they feature three different spool valves to improve on-road stability and resist off-road abuse.

The 2024 Sierra 2500HD AT4X also features a unique lower and upper control arm, as well as redesigned front suspension. A larger skid plate on the transfer case and an aluminum bash plate protect the bottom of the truck from damage. The AT4X kit also includes an electronically locked rear differential and an Off-Road driving mode for tackling tough obstacles.

Customers can select between the standard gas-fed V8 with 401 horsepower or the Duramax Diesel 6.6-liter V-8 that produces 470 horses and 975 pounds-feet.

Exterior and interior

The AT4X and other Sierras with less heavy-duty are missing the hardcore components that only the Extreme AEV edition can offer. It’s essentially a fortified AT4X with exclusive parts supplied by aftermarket supplier AEV. This more extreme version of the AT4X comes with front and rear bumpers stamped in steel that includes a winch and recovery points. AEV’s gloss black 18-inch AEV-specific wheels and tougher underbody protection complete the package.

The AT4X Extreme AEV Edition and AT4X have minor differences in terms of technical specifications. The AT4X and the Extreme AEV Edition have an identical departure angle of 25.7 degrees, with a ground clearance that is almost identical at 11-16-17 inches. The AEV, however, has a slighter steeper break over of 22.6 (versus 21.2). The AT4X, on the other hand, has a steeper approaching angle (31.6% vs. 29.8%). GMC claims that the AEV-equipped version is 378 pounds heavier than the standard model, and 368 pounds heavier for the oil-burning variant.

The AT4X Edition and Extreme AEV Edition benefit from GMC’s updates to the Sierra HD 2024 lineup, which include a refreshed interior and new styling. The AT4X and Extreme AEV Edition also feature desirable features such as a 12.3″ digital gauge cluster with a center 13.4″ touchscreen display, a head-up display, etc. Each model has a number of luxury features, including genuine wood trim on the interior, leather seating, massage front seats, and a Bose 12-speaker sound system.

2024 GMC Sierra 2500HD AT4X Interior
2024 GMC Sierra 2500HD AT4X Interior

Release Date and Price

Production of the 2024 GMC Sierra AT4X and Extreme AEV Edition is expected to begin this fall. GMC isn’t saying how much each version will cost. We expect the base price to be around $90K with an additional $8000 for AEV-enhanced models.