2025 Gmc At4x 2500hd Diesel. Denali goes ultimate, at4x joins the ranks. The 2025 gmc sierra 2500 hd at4x aev edition adds functional style from american expedition vehicles trove of aftermarket accessories in a production package.

View detailed specs, features and options for the 2025 gmc sierra 2500hd 4wd crew cab 159 at4x at u.s. General motors officially unveiled the fully refreshed 2025 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level lineup, and.