I think you are looking for a solution to a problem that doesn't exist?
The cases leak from transverse load to the shaft ovalling the soft casing.
Once you sleeve the case, no more ovalling possible.
So whack on a new o-ring and go to town with whatever sealant you like.
The shaft is fixed in place by the staked nut so fill up the gap between the shaft and the sleeve with any sealant you choose.
I turned my sleeve as close and smooth to diameter as possible, new o-ring and cleaned it all before assembly then applied locktight 569 hydraulic sealant.
YMMV
Steve
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
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