This truck is powered by a Cummins isx15 Turbo rated at 450 HP. The truck has very good power. The transmission is an Eaton 13 speed (16913), absolutely no play or slack and shifts smooth. Rear differential ratio is 3.36. The only has 563k miles and it shows. Brand new 10 tires. Good brakes. Aluminum rims, freshly polished with lots of shine. Zero rust anywhere on this truck.