Jack is a dull boy if he spends all his time working. Jack is not a happy boy unless he drives a 2024 GMC Sierra AT4X or Extreme AEV edition, the two models that are the most off-road focused in the heavy-duty lineup. The AT4X can tow up to 18,500 pounds or haul a payload of up to 3300 pounds. It is as capable as other Sierras of this size, but it also comes with all the equipment needed to have some fun after the day’s work.
2024 GMC Sierra 2500HD AT4X Review
The AT4X badge was first introduced to the Sierra HD in 2022, but the AT4X badge is now available on all Sierra HD models starting with the 2024 model. The regular AT4 was previously the top-of-the-line off-road option for heavy-duty pickup trucks. It is available on both the 3500HD and 2500HD. The AT4X can only be ordered on the 2500HD with the crew cab and standard cargo bed.
The Sierra 2500HD AT4X shares many of the same features as the 2024 Chevy Silverado ZR2, which was recently unveiled. Both trucks are equipped with black 18-inch wheels and 35-inch Goodyear Wrangler Territories M/T tires. Multimatic DSSV spool valve dampers are used to support the AT4X truck’s suspension, which is 1.5 inches higher. These fancy shocks are also found on race cars and trucks. They feature three separate spool valves to improve on-road stability and resist off-road abuse.
The 2024 Sierra 2500HD AT4X also features a unique upper and lower control arm, as well as a revised suspension front with improved steering knuckles. A larger steel skid plate for the transfer is added to the front bash plate, which protects the bottom of the truck from damage. The AT4X kit also includes an electronic locking rear differential and an Off-Road mode for tackling tough obstacles.
Engine & Specs
Customers can choose from two engines: the standard 401 horsepower gas-fed 6.6 liter V-8 engine or the optional Duramax Diesel 6.6 liter V-8 which produces 470 horsepower with an impressive 975 pounds-feet torque. The AT4X, and other Sierras with less heavy-duty capability, lack the hardcore hardware found only on the Extreme AEV edition. It’s a fortified AT4X with exclusive parts from an AEV aftermarket supplier. The off-roader is equipped with front and rear bumpers stamped in steel that include a winch and recovery points. AEV’s gloss black 18-inch AEV-specific wheels and tougher underbody armor complete the package.
The AT4X and Extreme AEV Edition have minor differences in terms of technical specifications. Both versions have the same 25.7-degree departure angles, and their ground clearances are virtually identical at 11.6 to 11.7 inches. The AEV, however, has a slightly steeper breaking angle (22.6 degrees versus 21.2). The AT4X, on the other hand, has a steeper approaching angle (31.6 degrees versus 29.8). GMC claims that the AEV add-ons make it heavier. The gas-fed version is 378 pounds heavier and the oil-burning version is 368 pounds heavier.
The AT4X and Extreme AEV Edition benefit from GMC’s updates to the 2024 Sierra HD line, 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, a 13.4″ center touchscreen, and a head-up display. Each model has several luxury features, including genuine wood interior trim and leather upholstery. The front seats are also massaging, as is the Bose 12-speaker sound system.
2024 GMC Sierra 2500HD AT4X Price & Release Date
Production of the 2024 GMC Sierra AT4X and Extreme AEV Edition is expected to begin this fall. GMC hasn’t revealed the price of either version, but we anticipate a base cost of around $90K with an additional $8000 for the AEV-enhanced model.