2026 GMC Sierra 1500 AT4 Vs. AT4X Side-By-Side Trim Level Comparison
Purchasing your next all-terrain GMC Sierra 1500 truck becomes easier once you know the differences between the AT4 vs. AT4X. The GMC Sierra 1500 AT4 is the ultimate pickup for going off the beaten path, offering 11.1 inches of ground clearance, up to 9,000 pounds of towing capacity,1 and dozens of safety and convenience amenities to make tackling the roads less traveled straightforward.
However, when it comes to the AT4X at DeVoe Buick GMC, you'll discover just how comfortable off-road travel around Florida's Gulf Coast can be in this model, thanks to added 16-way front-row seats, a standard Head-Up Display, and a Bose® Premium Series 12-speaker sound system.
Let's examine how these two vehicles stack up against each other and what they have in common. Then, you can come to our lot for a tour and a test drive.
Key Takeaways: 2026 Sierra 1500 AT4 vs. AT4X
- The 2026 Sierra 1500 AT4 comes standard with a Duramax 3.0-liter turbo-diesel engine with a 10-speed automatic transmission, 2-inch factory lift, and underbody skid plates.
- A distinctive Jet Black interior with Kalahari accents and heated and ventilated perforated leather front seating surfaces are also included on the AT4.
- The Sierra 1500 AT4X builds upon the AT4 by adding Multimatic DSSV dampers, front and rear electronic locking differentials, and 16-way power heated and ventilated front seats with a massage function.
- The AT4 Crew Cab is offered with a short or standard bed, while the AT4X Crew Cab is only paired with the short bed.
Have the AT4X and AT4 Trim Levels Changed for 2026?
Comparing the 2025 and 2026 GMC Sierra 1500 AT4 vs. AT4X, you'll find that these all-terrain-focused trims of the truckmaker's popular half-ton pickup have not changed for the new year. You'll get the same level of impressive off-road capability as last year, whether you ultimately opt for the AT4 or the AT4X.
Now that you know what hasn't changed with these latest editions, let's look at what's included with each trim and the differences between them.
2026 GMC Sierra 1500 AT4 vs. AT4X Exterior & Design
The GMC Sierra 1500 AT4 exemplifies bold and durable style. Its high lift and up to 11.1 inches of ground clearance stand tall over the competition, while a grill stands clear above its sturdy, damage-taking bumper. A rectangular and well-constructed frame lets the AT4 look dominant as it conquers heavy trails.
The GMC Sierra 1500 AT4X has many excellent amenities similar to the AT4 that make it so notable, but it adds the AEV bumper with built-in winch support. With other available AEV products, like the underbody skid plate or steel rear bumper, you'll have an armored ride ready to traverse some of the most daunting challenges that nature can throw.
2026 GMC Sierra 1500 AT4X vs. AT4 Interior Equipment
Your interior continues this promise of durable majesty. As a high-level trim of the new GMC Sierra 1500, the AT4 comes standard with dozens of convenient amenities, like the in-vehicle trailering app, keyless open and start, a ventilated driver's seat, heated rear seats, an HD Surround Vision Camera, and dual-zone automatic climate control for the ultimate comfort. Leather seats bring refined comfort in both variants.
The AT4X raises the bar even further. With a standard Bed View Camera, Head-Up Display, Universal Home Remote, and Bose® Premium Series 12-speaker sound system, the AT4X's cabin is a state-of-the-art masterpiece. You'll even be able to get a massage via the 16-way powered front seat as you take on trails or your daily commute.
GMC Sierra 1500 AT4 vs. AT4X Specs & Performance
While the AT4X leads in terms of standard comfort amenities, the performance of these two models is quite even. The AT4X has a greater payload capacity when comparing the two models with a short bed, but they also share engine options and the same amount of cargo bed volume. Read more details in the chart below.
| Specifications | AT4 | AT4X |
|---|---|---|
| Strongest Engine | 6.2L EcoTec3 V-8 | 6.2L EcoTec3 V-8 |
| Standard Engine | 3.0L Duramax Turbo-Diesel | 3.0L Duramax Turbo-Diesel |
| Transmission | 10-speed automatic w/ Electronic Precision shift | 10-speed automatic w/ Electronic Precision shift |
| Best Horsepower | 420 | 420 |
| Best Torque | 495 lb-ft | 495 lb-ft |
| Best Towing Capacity | 9,000 lbs1 | 8,900 lbs1 |
| Best MPG Rating (City / Hwy / Cmb) | 22 / 26 / 24 MPG2 | 19 / 20 / 19 MPG2 |
| Configuration Options |
|
4WD Crew Cab Short Bed |
| Length | 232.9 - 242.45 in | 233.96 in |
| Width | 81.24 in | 81.23 in |
| Height | 78.24 - 78.35 in | 78.65 in |
| Cargo Capacity | 62.9 - 71.7 cu ft | 62.9 cu ft |
| Payload Limit | 2,315 - 2,372 lbs3 | 2,472 lbs3 |
While the AT4 uses the same engine as the AT4X, it can come out with potent specs. For example, the AT4 can come with a short or standard bed, while the AT4X is locked to a short bed. This gives you more cargo capacity to work with while preserving the impressive MPG ratings of the AT4. The AT4 also has a higher towing capacity compared to the AT4X. You can compare various Sierra 1500 towing specs across the trim lineup with our team.
The spacious crew cab remains the same between these two GMC Sierra 1500 trim levels. Whether you climb into an AT4 or AT4X, you can relax in over 43 inches of front headroom, more than 44 inches of front legroom, a 40.12-inch rear head space, and 43.4 inches of legroom for rear passenger seats.
GMC Sierra 1500 AT4X vs. AT4 Off-Road Capabilities
That difference between Sierra 1500 AT4 and AT4X pickups in terms of performance is because of the expressive suspension and protective features of the AT4X, like the full-locking front and rear differential. This goliath of the trail leverages an array of evolutionary components, as highlighted below, to become a paragon of weekend excursions.
| Specifications | AT4 | AT4X |
|---|---|---|
| Front Ground Clearance | 11.1 in | 11.5 in |
| Rear Ground Clearance | 11.1 in | 11.1 in |
| Standard Off-Roading Features |
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| Available Off-Roading Features |
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GMC Sierra 1500 AT4 vs. AT4X Safety
Both models have Lane Keep Assist, Lane Departure Warning, Automatic Emergency Braking, and Safety Alert Seat systems by default. You can connect to OnStar® Basics for remote services, including Automatic Crash Response, to get immediate aid in an emergency. Your upgrade solutions are also high-end.
For example, the AT4 has an available Head-Up Display, Rear Camera Mirror, and Bed View Camera – all of which are standard on the higher-level trim. Meanwhile, both models can be enhanced to get options like an Auxiliary Trailer Camera.
Explore AT4 vs. AT4X Similarities & Differences at DeVoe Buick GMC
The GMC Sierra 1500 is one of the most competitive off-road trucks in the business, and the AT4 and AT4X exemplify that dedication to exploring nature in style. When you visit our showroom, our representatives will be happy to let you explore both of these trims with your family. Once you locate your preferred trim level and add-ons, our GMC Sierra 1500 specials mean these enhancements to your next off-roading adventure are well within your reach.
Find Your Perfect New or Pre-Owned GMC Pickup Here
As a reliable and sought-out Florida Gulf Coast GMC dealer, DeVoe Buick GMC is ready to supply you with a wide-ranging selection of new and late-model trucks spanning the current and recent GMC lineups.
Drivers searching for the latest GMC technologies and capabilities can also consider other models, such as the:
Alternatively, consider pre-owned pickups, including gently used models from the following GMC lines:
Frequently Asked Questions
What is the difference between the GMC Sierra 1500 AT4 and the AT4X?
The GMC Sierra 1500 AT4 tackles the off-road with exceptional style. A 2-inch factory-installed lift assists its already impressive off-road suspension, allowing you to take on the wilderness without any issues. However, those who want additional bells and whistles – like a front and rear electric locking differential, 16-way seats, and an AEV bumper with winch capability – should invest in the AT4X.
What does the GMC AT4X package include?
The GMC AT4X is designed to enhance your off-roading journey with expressive style changes and excellent protection features. It comes with a 2-inch factory-installed lift, Multimatic DSSV dampers, and over 2,400 pounds of payload capacity.3 You'll also feel more comfortable and safe with 16-way seating, a ventilated driver seat, a Head-Up Display, and available AEV underbody skid plates.
Is the GMC AT4X lifted?
Yes, the GMC AT4X comes standard with a 2-inch factory-installed lift to help you easily navigate rough terrain. Alongside off-road suspension with DSSV dampers, you should have no issue clearing extremely rocky terrain. If you plan to go off-road often, the AEV package includes underbody skid plate protection and heavy-duty cast recovery points for your rear bumper.
GMC Sierra 1500 Reviews In Florida
1GM-estimated. Maximum trailering ratings are intended for comparison purposes only. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner's Manual. The trailering capacity of your specific vehicle may vary. The weight of passengers, cargo and options or accessories may reduce the amount you can trailer.
2EPA-estimated mpg for the 3.0L Duramax Turbo Diesel with 10-speed automatic 4WD. Estimates only. For more information, please visit the official U.S. government source for all fuel economy at www.fueleconomy.gov
3These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner's Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver's door jamb.