2024 2500hd Duramax Denali.  — refreshed for 2024, the restyled sierra 2500hd offers several enhancements tied to towing. Explore the 2025 gmc sierra hd at4 and at4x.

 — 2024 gmc sierra 2500hd and 3500hd pickup trucks equipped with the denali ultimate trim are the only truck in gmc’s lineup that come standard with the 6.6l.  — 2024 gmc sierra 2500 and 3500 hd first look: