2024 At4 2024 Duramax Specs. 2024 gmc sierra 1500 at4 in sterling metallic (a $495 color option) 2024 gmc sierra 1500 at4 specs. General motors officially unveiled the fully refreshed 2024 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level.

The specs say 36 gallons, of course. The 2024 duramax appears to be even more bulletproof than the 2023.