TFL Truck tested them all towing 12,000# 5ers at a Ford press event. All 3 had 3.73 axles according to Ford. VIDEO Time to climb the 7% grade: Ford 2:36 Ram 2:45 Chevy 2:50
Rotating engines can only produce torque, which does the work.
Which is why the nearly 400hp RAM Cummings cannot do the work in 12 hours at the speed limit that a 400hp ISX Cummings can do in a heavy duty truck hauling 80,000lbs, expressed in tons moved x distance in 12 hrs., at the speed limit.