Ford Authority

2024 GMC Sierra HD AT4X Debuts As New Super Duty Tremor Foe

Back in October, General Motors revealed the refreshed 2024 GMC Sierra HD lineup, which serves as a direct rival to the Ford Super Duty as a more capable, heavier-duty alternative to light-duty pickups. That updated model introduced revised styling inside and out, along with new tech and a bit more towing prowess. Then, just a couple of weeks ago, GM also introduced the 2024 Chevy Silverado ZR2, the latest version of that more off-road focused pickup. Now, Ford’s cross-town rival has debuted the new 2024 GMC Sierra HD AT4X as it continues to expand its list of rugged variants.


As one would expect, the 2024 GMC Sierra HD AT4X essentially mirrors the upgrades present on the Sierra 1500 AT4X, meaning that it’s more of a middle-of-the-road upgrade similar to what the Super Duty Tremor offers. Those upgrades start underneath with the presence of a 1.5-inch suspension lift, Multimatic DSSV dampers, a rear e-locking differential, unique steering knuckles, and revised front upper and lower control arms.


The extra clearance added by the aforementioned lift makes room for a beefier set of 35-inch Goodyear Territory tires, while the truck’s vitals are protected by an aluminum front skid plate and steel transfer case plate. When the going gets tough, the Sierra HD AT4X also comes equipped with a special Off-Road driving mode designed to enhance performance off the pavement.

One thing the rugged pickup doesn’t get is any extra power, as it’s available with the naturally aspirated 6.6L V8 L8T engine rated to produce 401 horsepower and 464 pound-feet of torque, the optional turbocharged 6.6L V8 L5P Duramax diesel makes 470 horsepower and 975 pound-feet of torque, and both are mated to the Allison 10-speed automatic transmission. Max towing capacity comes in at 18,500 pounds, making this a capable off-roader and work rig that’s currently slated to launch this fall.

We’ll have more on everything Ford’s competition is up to soon, so be sure and subscribe to Ford Authority for ongoing Ford news coverage.

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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