2019-2026 GMC Sierra AT4 - Monochrome Cotton T-Shirt
Not sure it fits? Read our tips.
Fitment tips
Fitment can come down to more than year, make and model. Sometimes the sub-model decides, so start with the fitment table below.
- Drive type. If your car is all-wheel drive, make sure the part is for all-wheel drive, not rear-wheel drive.
- Engine size. For engine parts, make sure the engine size on the product matches your engine.
- Transmission. Manual and automatic cars often take different parts.
- Body style. Sedan or hatch, two-door or four-door, cab and bed length on trucks.
Manufacturer data can sometimes have imperfections. Still not sure? We are happy to help.
Send us a message and we will confirm the fit.
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The 2019-2026 GMC Sierra AT4 pioneered the premium off-road truck segment, introducing the industry-first six-function MultiPro tailgate. By combining a standard two-inch factory lift with high-end cabin amenities, it proved heavy-duty trail capability and luxury could coexist without compromise.
Under the hood, the optional L87 EcoTec3 6.2-liter V8 engine delivers 420 horsepower and 460 pound-feet of torque. This naturally aspirated, overhead-valve powerplant features Dynamic Fuel Management, which constantly deactivates cylinders to optimize efficiency without sacrificing peak output.
Power travels through a ten-speed automatic transmission to an Autotrac two-speed transfer case. Off-road performance relies on Rancho monotube shocks, underbody skid plates, and an Eaton locker. This setup excels at low-speed technical crawling while maintaining composed high-speed highway manners.
Replacing the older All Terrain package, the AT4 became a highly sought-after trim, representing over twenty percent of Sierra sales. It remains a coveted daily driver and tow vehicle. While the extreme AT4X now sits above it, the standard AT4 remains the cornerstone of GMC's modern off-road lineup.
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