in all fairness peps do change it and tighten it back up but my waffle up there , well i suppose is by the book,
i suppose its best to kow it might be a pain than just going a head,
I have reused crush sleeves on teh front diff with fwh as they only move off road so it isnt so bad rear ones really need to be well setup,
second hand unit wont be expensive but make sure its a good one :-)