A few weeks ago, the world witnessed the 2024 Chevrolet Silverado HD ZR2 Bison. It’s the first time. The specification sheet has all the necessary fixings. Say you don’t like the Chevy vibe. You wanted something a little more luxurious. You’re in luck, right? Welcome to the 2024 GMC Sierra HD AT4X Edition. The truck is designed to carry, haul and pull all your belongings into the wilderness, with massaging seats.
2024 GMC Sierra HD AT4X AEV Edition: Details
The AT4X AEV Edition is available with robust, stamped steel bumpers that have integrated recovery points as well as front winch capabilities. This provides additional driver confidence and safety. The AT4X AEV Edition also comes with heavy-duty skid plates to protect vital components like the steering gear or transfer case on the trail. Other features include 18-inch Salta rims, exterior branding, and interior cues.
The heavy-duty truck shares the same performance-driven approach, dedication to detail, and off-road capabilities as the GMC Sierra 1500 AT4X. The turbocharged 6.6L Duramax Turbo-Diesel engine, which has been improved for 2024, will make this vehicle a beast on the road with 470 horsepower. If you do not want to go with the Duramax, there is also a standard 6.6L gasoline engine. Both engines come with Allison 10-speed transmissions that optimize power, torque, and efficiency.
Off-Road mode is a new feature available on both the GMC Sierra HD AT4X and the AEV edition. Off-Road Mode, when activated, adjusts the vehicle’s calibrations such as anti-lock breaks, traction control, and stability control to optimize performance off-road. Off-Road Mode also alters the throttle progression and transmission shifting to improve off-road performance and control.
A Semi Truck Off-Road
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. 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, as well as an Off-Road driving mode that helps you overcome tough obstacles. Customers can choose from two engines: the 401-hp gas-fed V-8 with Allison 10-speed transmission or the Duramax diesel V-8 that produces 470-hp and 975-pound-feet-of-torque.
An Extra Extreme AT4X
The AT4X, and other Sierras of lesser weight, 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, a head-up screen, etc. 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. Production of the 2024 GMC Sierra AT4X and Extreme AEV Edition is expected to begin this fall. GMC has not revealed the price of either version, but we anticipate a base cost of around $90K with an additional $8000 for the AEV-enhanced model.
The 2024 GMC Sierra AT4X, and especially the top-of-the-line AEV Edition, takes the already highly desirable and tamer AT4 model off-road to the next 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 trucks weighing three-quarters of a ton.
The Sierra 2500HD at4x is mechanically similar to the Silverado 2500HD ZR2 and features MultiMatic Dynamic Suspension Spool Valve dampers paired up with a 1.5-inch suspension lift installed by the factory for greater ground clearance. The suspension mods are completed by “Specific” upper, and lower control arms, and steering knuckles. The front skidplate is made of aluminum, and the underbody skidplate is steel. Both are designed to protect vitals when off-road. Approach/breakover/departure angles for the AT4X come in at 31.6/25.7/21.2 degrees.
The 305/70R18 Goodyear Wrangler Territories MT tires are mounted on 18-inch aluminum rims. These tires are essentially 35-inch tires (actually 34.8 inches). The HD Sierra has a locking rear differential, but not a locking front differential. This is because the larger truck would destroy the locking front differential. The new Off-Road Mode allows you to adjust things like anti-lock brakes and traction control as well as transmission shifts and throttle for a more aggressive off-road performance.
The exclusive Obsidian Rush Interior of the GMC Sierra 2500HD at4X 2024 provides the best protection from the elements. It features power massaging seats in the front, leather-wrapped seating throughout, Vanta Ash decor, and an audio system by Bose Premium Series with Centerpoint surround sound technology. The interior features a 13.4-inch touchscreen infotainment system, complemented by a 12.3-inch Driver Information Center and upscale 15-inch Head-Up Display.
The GMC Sierra HD AT4X, which is only available as a 2500HD Crew Cab Standard Bed with four-wheel-drive, can be powered by either the 6.6-liter gasoline V-8 engine (401 horsepower/464 lb.-ft. of torque) or by the Duramax turbodiesel 6.6-liter (470 horsepower and 975 lb.-ft.), both paired to an Allison 10-speed transmission.
AT4X diesel, which is the heaviest AT4X model, weighs 8,605 pounds. The AT4X gas, however, 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). Trailering assistance and technology are abundant: Transparent trailer view, Trailer Side blind zone alert, Adaptive cruise control with Trailering, and 14 camera views.
2024 GMC Sierra HD AT4X AEV Edition Release Date & Price
AT4X AEV Edition is the GMC version (co-developed by American Expedition Vehicles or AEV) of the special edition Silverado 2500HD ZR2 Bison. This AT4X alpha gets AEV bumpers stamped in steel with integrated recovery points, and front winch capabilities (c’mon! Give us the winch too!). Heavy-duty steel skid plates protect the engine and steering rack. They also protect transfer cases, exhaust, and transfer cases. The Sierra HD AT4X AEV edition is rounded out by sleek 18-inch AEV Salta rims, distinctive exterior badging, and AEV logoed headrests for the front seats. The Sierra HD AT4X AEV Edition will be offered in both gas and diesel. The added gear will add about 375 pounds for each.
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. If we were to bet, we would choose the Sierra HD AT4X for Overland Expo’s next “Ultimate Overland Vehicle”.