I stumble on these old videos from time to time. I thought this on was neat because it explains in a simple way how a rear differential works. YouTube Video Thanks! Jeremiah
It sure looks like one wheel drive when the wheel in the mud spins and the wheel on dry pavement does nothing. Yes they both get the same torque. However there is no work done when there is no motion. The wheel in motion is doing the work and the vehicle does not move.