GMC AT4 vs. AT4X Trims

Your Ultimate Guide to Off-Road Capability in the Cedar Valley

As the go-to GMC dealership serving families and customers in Cedar Valley and surrounding Iowa communities since 1969, Community Buick GMC knows how to treat customers like family. As a family-owned and operated dealership, we’re 100% committed to ensuring all customers have the very best selection of high-performance Buick SUVs and heavy-hauling GMC pickups.

For thrill-seekers wanting a GMC pickup, it often comes down to choosing between the AT4 and AT4X trims. While both are off-road trims, there are some essential differences to be aware of.

Choose Between the AT4 and AT4X trims at Community Buick GMC

The AT4 is GMC’s premium off-road-focused trim and is available on the GMC Canyon, Sierra 1500, Sierra 2500 HD, and the Sierra 3500 HD. GMC has managed to combine everyday driving comfort and enjoyment with an off-road-capable trim.

The AT4X takes that off-road capability to a whole other level and is available on the GMC Canyon, Sierra 1500, and Sierra 2500 HD. So, how does the AT4X improve upon the AT4?

First, depending on the make of GM truck, the AT4X trim can come with higher ground clearance, larger, more robust off-road tires, electronic front and rear locking differentials, off-road-specialized skid plates, and Multimatic DSSV (Dynamic Suspension Spool Valve) dampers. Second, while the AT4 trim is more than capable of handling dirt roads, jobsite roads, mud, and trails, it is generally more for recreational off-roading. When it comes to the AT4, think of a truck that can easily tackle tough dirt and gravel roads with ease.

Third, the AT4X is for those Community Buick GMC customers who want their GMC truck to be capable of handling much more challenging off-road terrain.

GMC Sierra 2500 HD AT4

The GMC Sierra 2500 HD AT4 comes with GMC’s Off-Road Suspension Package, which includes Twin-Tube Rancho shocks, skid plates for underbody and undercarriage protection, and Hill Descent Control. The AT4 also provides 10.1 inches of ground clearance while including heated and ventilated leather front seating.

• Off-Road Suspension Package
• Twin-tube Rancho shocks
• Skid plates for underbody protection
• Hill Descent Control
• 10.1 inches of ground clearance
• Heated and ventilated perforated leather front seats
• Maximum towing capacity of up to 21,300 lbs. (6.6L Duramax Turbo-Diesel V8)

GMC Sierra 2500 HD AT4X

The GMC Sierra 2500 HD AT4X comes with a 1.5-inch factory-installed suspension lift. This provides better ground clearance against rocks, dangerous debris, and uneven terrain, which helps to protect the undercarriage of the GMC Sierra 2500 HD. It also provides more room for the 35-inch off-road tires.

Multimatic DSSV dampers are also added, as well as a rear electronic-locking differential and a larger transfer-case skid plate for the back and an aluminum skid plate for the front. Both skid plates also protect the undercarriage.

35-inch Goodyear Territory MT tires are standard, and the AT4 ups the ante in terms of ground clearance by a full 1.5 inches for an 11.6-inch ground clearance. A higher 31.6-degree approach angle and 25.7-degree departure angle, coupled with all the off-road upgrades, means that the GMC Sierra 2500 HD AT4X tows less than the AT4 at 18,500 pounds.

• Multimatic DSSV dampers
• Rear electronic-locking differential
• Larger steel transfer-case skid plate
• Front aluminum skid plate
• 35-inch Goodyear Territory MT tires
• 11.6 inches of ground clearance
• 31.6-degree approach angle / 25.7-degree departure angle
• Maximum towing capacity of up to 18,500 lbs.

Choose Between the AT4 and AT4X trims at Community Buick GMC

Ultimately, the AT4 trim is ideal for those drivers who drive on challenging roads (gravel, sand, off-road trails, and job sites) but don’t want to give up too much in towing capacity. This is the trim for those individuals who want to go off-road but not to extremes. The AT4X is the trim that drivers need when handling the toughest and most challenging of terrains.

If you are interested in either the AT4 or AT4X trims on any of the GMC trucks but have questions, visit us or call our sales team at (319) 349-2126.

What is the starting price difference between the AT4 and AT4X trims?

The 2026 GMC Sierra HD AT4 starts at $72,200, while the higher-tier AT4X starts at $85,200.

How do the suspension and off-road hardware compare between the two trims?

The AT4 features an Off-Road Suspension Package with twin-tube Rancho® shocks, skid plates, and 20″ wheels. The AT4X steps up significantly with a factory-installed 1.5″ suspension lift, Multimatic® DSSV dampers, a rear electronic-locking differential, heavy-duty skid plates, and 35″ Goodyear® tires.

What are the interior styling and seating differences?

The AT4 comes with an exclusive Jet Black interior with Kalahari accents and heated/ventilated perforated leather seats. The AT4X upgrades to an Obsidian Rush interior featuring full-grain leather with technical-grain accents, authentic Vanta ash wood, and 16-way power front seats with a massage feature.

How do their maximum towing capacities compare?

The AT4 offers a maximum available towing capacity of up to 21,300 lbs. In comparison, the off-road-focused AT4X has a maximum available towing capacity of up to 18,500 lbs.

What unique interior technology options are available on each trim?

The AT4 offers an available 15″ diagonal Head-Up Display equipped with an off-road inclinometer. The AT4X focuses its high-tech comfort primarily on luxury amenities like 16-way power-adjustable front seats with built-in massage features.

Community Buick GMC

Address: 4030 Lowes Blvd, Waterloo, IA 50701

Phone: (319) 349-2126

Hours of Operation:

Monday – Thursday: 8:00 AM – 8:00 PM
Friday – Saturday: 8:00 AM – 6:00 PM
Sunday: Closed