2024 Gmc 2024 Hd At4x. 2024 gmc sierra hd at4x & at4x aev edition specifications. Two engines will be offered in the 2024 gmc sierra hd, both of them displacing 6.6 l.

 — 2024 gmc sierra 2500hd at4. 2024 gmc sierra hd at4x & at4x aev edition, select a 2024 gmc sierra at4 and at4x hd to view feature and capability specs on the official site.