I replaced the seal on the axle but it looked to me that the bearing had a little wobble to it. Since a New Koyo bearing wasn't that much I might as well replace it. Some have said that the wobble can cause the seal to go bad. makes sense but I have seen the front rubber crank seal cut a groove in the steel shaft of the crank pulley. This make me think it possible that the seal in the axle could cut into the bearing retainer ring.