2025 Gmc 2025 Hd At4. Select a 2025 gmc sierra at4 and at4x hd to view feature and capability specs on the official site. General motors officially unveiled the fully refreshed 2025 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level.

The first ever sierra hd at4x and at4x aev edition is taking the at4 experience to the next level. Gmc is building on the at4 legacy with the first ever sierra hd.