My crown wheels went on tight when new - after a rebuild they just slide on now the cars been run a bit. Diffs dont leak anymore - make sure you put loads of grease on the x seals and only fill the diff just to the top of the metal shafts, i was overfilling them to start with.
Im running 6000wt rear 12500wt front, i would expect the chance of leaking more with lighter weight oil.
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