2025 Gmc Sierra 2500hd At4. The powertrain consists of a 6.6. General motors officially unveiled the fully refreshed 2025 gmc sierra hd last october, revealing an updated exterior, an overhauled interior, a new trim level.

Received my 2025 2500 at4 about a month ago after waiting 10 weeks or so. Research the 2025 gmc sierra 2500hd with our expert reviews and ratings.