on the passenger axle there's a brass colored round thingy about 3" from the tranny end. it sits right up next to the axle/tranny seal when the axle is installed. these things are are getting smashed pretty bad. i may be able to remove the good one from my Raxle, but shouldn't HAVE to. then, if i damage my used "good one" in the process, i'm REALLY screwed.