The right front axle is a two piece design. It has two ends that are splined, a
collar slips over the splines to lock the two halves of the axle together ( a
lot like a manual transmission ). Because the differential is "open", if one
axle is not attached to a wheel the differential can not transmit power. So if
the hubs are locked the differential will not work until the collar locks the
two halves of the axle together. That is how this system gives you "shift on the
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