Originally Posted by T. Hodge

Hi Fred,

When you have the front of the car facing away from you, you should be able to hold the left rear tire and spur gear at the same time, then try and rotate the right rear tire. This should barely slip. If you do the opposite, the left tire should slip more so than the right side. On the diff hub the diff ring is keyed by the D-ring. On the diff tube side the diff ring is intended to slip on the brass washer to act as a slipper for you diff. This increases diff life immensely. We have run this setup in mod a lot and it has worked great giving greater diff life to our cars.