2024 Gmc At4x 2024 Specs. View detailed specs, features and options for the 2024 gmc sierra 2500hd 4wd crew cab 159 at4x at u.s.  — with the 2023 redesign, the canyon at4x model entered the canyon lineup, and the even more extreme canyon at4x aev edition arrived in 2024.

 — gmc sierra at4x very light usage zero accidents.  — with the 2023 redesign, the canyon at4x model entered the canyon lineup, and the even more extreme canyon at4x aev edition arrived in 2024.