Main Shaft Seal

Q: My husband has a 1979 Harley custom chopper w/ a 80 in shovel an 4 speed trans. He’s having problems with the trans. leaking grease on the drive side. The main shaft seal was replaced, was good for a couple weeks then started leaking again. Any ideas?
Anita B via Facebook

A: The bushing that supports the main shaft is probably worn; allowing the main shaft to have excessive runout. New seals will not stop your trans from leaking. The trans will need to be torn down and rebuilt.

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