Gmc 2024 2500hd At4x. Gmc is building on the at4 legacy with the first ever sierra hd at4x and at4x. The 2024 gmc sierra 2500 4wd crew cab at4x brings a delicious combination of comfort, style and brute force to market, for a price.

Gmc is building on the at4 legacy with the first ever sierra hd at4x and at4x. That’s a worse than average energy impact score with use of 18.6 barrels of oil yearly and 9.3 tons of co2 emissions.