F350 Super Duty vs 3500 Denali vs The Ike Pulling 30k lbs

The formula for calculating horsepower from torque is constant regardless of engine. No matter what kind of engine, if it is making X torque at Y rpm, then it is making Z horsepower at Y rpm. If you have a diesel and gas making 400 lb-ft at 2,000 rpm, then both are making 152 horsepower at 2,000 rpm.