I have a diff on the way, but are there any seals/gaskets that should be checked/changed out during the swap? What should I go ahead and order now so the swap goes quickly? Thanks.

 

A tube of some sort of sealant and possibly new bearings depending on their wear.
Use an 85/140 gear oil in the future.

 

Forgive me Mike, I'm new to working on 4x4s. Specifically which bearings should I get? And does LR make a gasket for the differential or do I just use black RTV which seems to be on both of my diffs already? Thanks again.