2024 Gmc Sierra 2500hd At4x Release Date. The new 2024 gmc sierra hd at4x will launch later in 2024. Production of the refreshed 2024 gmc sierra hd pickup will soon begin at gm’s flint, michigan assembly plant.

Meet the first ever gmc sierra heavy duty at4x and at4x aev edition, redefining gmc’s commitment to. Previously, crew cab units of the 2025 sierra hd were expected to begin production on august 19 th, but now, production of crew cab units has been moved forward to.