The 2026 GMC Sierra 1500 AT4 and AT4X are premium off-road trucks. Both have standard four-wheel drive, a two-inch factory lift and a Duramax diesel engine.
The main difference is their level of off-road equipment.
AT4 vs. AT4X at a Glance
| Feature | Sierra AT4 | Sierra AT4X |
|---|---|---|
| Cab | Crew Cab | Crew Cab |
| Standard engine | 3.0L Duramax diesel | 3.0L Duramax diesel |
| Available engine | 6.2L V8 | 6.2L V8 |
| Drivetrain | Four-wheel drive | Four-wheel drive |
| Factory lift | 2 inches | 2 inches |
| Shocks | Rancho monotube | Multimatic DSSV |
| Wheels | 20-inch | 18-inch |
| Tires | All-terrain | 33-inch mud-terrain |
| Locking differentials | No front, but G80 auto rear differential | Front and rear e-lockers |
| Head-Up Display | Available | Standard |
| Massaging front seats | Not available | Standard |
| Sunroof | Available | Standard |
Engine Options
Both trucks have the same engine choices.
Standard 3.0L Duramax Diesel
The 3.0L Duramax turbo-diesel produces:
Available 6.2L V8
The available 6.2L V8 produces:
Check the window sticker to confirm which engine is installed.
What Off-Road Equipment Does the AT4 Include?
The Sierra AT4 comes standard with:
This equipment makes the AT4 more capable than a standard road-focused Sierra.
The AT4 is a strong starting point for shoppers who want off-road hardware without choosing the more specialized AT4X.
What Does the AT4X Add?
The AT4X includes the AT4’s standard content and adds more advanced off-road equipment.
AT4X Off-Road Upgrades
The locking differentials are one of the most important differences.
They can help send power to the wheels with traction. This is useful during difficult low-speed off-road driving.
Rancho Shocks vs. Multimatic DSSV Dampers
The AT4 uses Rancho monotube shocks.
The AT4X uses Multimatic DSSV dampers.
The DSSV system is designed for more advanced control during difficult off-road driving. It is one of the main reasons to move from AT4 to AT4X.
Both trucks keep the two-inch factory lift.
All-Terrain vs. Mud-Terrain Tires
The AT4 has:
The AT4X has:
The AT4X tire setup is more specialized for difficult terrain. The smaller wheel also allows room for a taller tire sidewall.
Shoppers should drive both tire setups before deciding. Tire type can affect road feel, sound and handling.
Interior Differences
Both trucks have a premium Crew Cab interior.
Standard on Both Trucks
AT4X Interior Upgrades
The AT4X adds:
Several of these features are available on the AT4 through packages. They are standard on the AT4X.
Technology Differences
Sierra AT4
The AT4 includes:
The AT4 Technology Package adds:
Sierra AT4X
The AT4X makes those three features standard.
It also includes:
Is the AT4X AEV Edition Available?
Yes. The AT4X AEV Edition is an available package.
It adds equipment such as:
This package is aimed at shoppers who want an even more specialized factory off-road truck.
Which Truck Should You Choose?
Consider the Sierra AT4 if:
Consider the Sierra AT4X if:
Frequently Asked Questions
Do the AT4 and AT4X have the same engine?
Both have the 3.0L Duramax diesel standard. Both offer the 6.2L V8.
Do both trucks have a factory lift?
Yes. Both have a two-inch factory lift.
What is the biggest difference between AT4 and AT4X?
The AT4X adds Multimatic DSSV dampers, 33-inch mud-terrain tires and locking front and rear differentials.
Does the AT4X have massaging seats?
Yes. The AT4X has standard 16-way power front seats with massage.
Does the AT4 have a Head-Up Display?
A 15-inch Head-Up Display is available through the AT4 Technology Package. It is standard on the AT4X.
Which truck can tow more?
Towing capacity depends on the engine and equipment. Check the truck’s VIN-specific trailering information.
Standard and available equipment can vary by vehicle.
