Horsepower 2024 At4 Gmc 6.6 Hp. (some of the trucks at tractor pulls were approaching 900 hp with that. He built his to almost 700 hp at the rear wheel per dyno.

If you want more horsepower out of your gmc sierra, there are several things you can do. Choose from either a gmc sierra 2500 hd or 3500 hd at4, and learn more about the vehicle specs, trims, and features available.