So I was replacing my rear wheel bearings and seals and noticed my pinion seal is leaking. So after researching here I find there may or may not be a crush sleeve I need to worry about. Seems like in the late 84 is when they started the crush sleeve. I can't find where to check what month my 60 was made but seems like I found it once to be a early 84 production. Any way to tell after I pull the seal which it has? I tried moving the flange and only getting a little movement, maybe a 1/16in at most. So do I just do the bit of getting the new nut back where the old nut is or is this a case of total rebuild?