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1

Unless you have locking differentials (most vehicles do not), each wheel can be turned independently when in park and raised in the air, you will notice when you turn a tire the opposite tire on the differential turns the opposite direction, but if the wheels are on the ground preventing that wheel from opposite rotation, park works. You can test this by ...


4

When park is selected it is only the gearbox output shaft that is locked in place, the open differentials that are fitted to the car are still able to do their job and allow relative rotation of the wheels. When the differential input is turned by the gearbox, the differential causes the wheels to rotate in the same direction. However if you rotate a wheel ...


1

When the vehicle was in the air the differentials in the drive train allowed the wheels to rotate. Once all four wheels were on the ground then each wheel was held stationary by friction relative to the ground and no one wheel could rotate as the other three were fixed. The same idea works if the vehicle is 2wd as if the input to the differential is locked ...


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