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New seals, new shims/crush sleeve, new bearings (most of that will be included in the new master install kit that you need to get), new o-rings especially for the ARB locker (make sure to get the brown one, the others were known to leak). I'm running them f/r on the CJ and love them.
Oh, and have a seasoned, professional gear shop do it. Doing gears correctly is an exact, involved science requiring specialized tools and if not done properly can result in busted gears/lockers. People may scoff, but I laugh at the JAs who pry theirs out w/ a pry bar and beat them back in with a hammer and wonder why they grenade their rear end in the drive way two weeks later.
 
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