2025 Gmc Sierra 2025 At4 Hd. View detailed specs, features and options for the 2025 gmc sierra 2500hd 4wd crew cab 172 at4 at u.s. General motors officially unveiled the fully refreshed 2025 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level lineup, and powertrain.

I am no expert at any of this,. Not many extra options (5th wheel prep, bed mat, cover, etc.), it pretty much has everything you’d want in the at4 package to begin with.