2024 Gmc 2500hd At4. Choose from either a gmc sierra 2500 hd or 3500 hd at4, and learn more about the vehicle specs, trims, and features available. Research the 2024 gmc sierra 2500hd with our expert reviews and ratings.
We explain what that means and what comes with that package in gmc’s trucks. The 2024 gmc sierra hd at4 and at4x pickup truck offers powerful capabilities and advanced technologies to help you take on the world in comfort and control.