I posted some pics on this in that thread about replacing the rear bearings on the site. On the axle itself it has a lip that when the bearing is pressed, it fits against it and leaves a space so the retainer ring moves a bit. That all tightens up when you put it in and those 4 nuts that hold it to the shaft. Just a note, all are metric except for those nuts. 9/16.
1999 Jeep WJ, 78,072 miles new adco sway bar in rear. new rotors hubs and caliphers, new cv axles up front, Repainted-all black. steering system better stabilizer new tie rods and tubes. New shocks.