In RST you do, its more or less the "Wheel Spin Graphs" only difference vs a wheel velocity graph is wheel spin normalizes for the vehicle speed aka long. slip ratio. As far as the graphs he posted, those graphs are very clearly not the driven axle which doesn't have a diff anyways. A locked diff will always cause both inside and outside tires to spin at the same velocity. The difference in 100% locking is in the definition that the sim uses. You can have 100% locking on the diff and still see a torque difference that causes the differential to unlock, but you wouldn't say that diff is fully locked you would say that it's open, when the diff is locked you will see both the inside and outside tires spinning at the same velocity.