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Speedo Angle Drive and Large Nut Seeping Gear Oil

Noticed my right angle drive is seeping gear oil. Large nut threaded to the ZF case is "loose" as is the angle drive that threads into it. Tightened them up but they seem to loosen back up with some running. Should these be tight to the case and should they have thread sealant on them to seal the joints. Roy Butfoy rebuilt this box 18 years ago and have ever have had this problem before? Any help or thoughts would be most appreciated.
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