2021 Cummins 1075 lbft peak torque at 1356 rpm

Here's the speed vs time output. My gear shifts are 200ms, during which I assigned an arbitrary 50hp (difficult to estimate engine output during clutch pack switch-over):



So @ 60s, our rig reaches 43.4 mph. At 120s, 43.8 mph, which is pretty max our V-max climbing this grade. This happens at 2881rpm in 4th, hp is 464.

Here we can see the gross thrust, before aero, tire, and gravity drag vs speed. Think of this as "drawbar pull" on a tractor:



17.67 kN, or 3971 lbs. Also in 4th of course.