How early a Disco S1?
If before 92 then it will have a white metal bearing in the bottom, and wear in this is what causes seal failure.
I have rebuilt an 81 Rangie box myself, but it entailed honing the bottom bearing for about 6 hours with a brake cylinder honing stone,as I didn't have a parallel cutter.
As long as the sector shaft is unmarked this will go for years.Or of course you can have it rebuilt with tapered bearings at a price.(exhorbitant???)
If after 92 and it has tapered bearings, I would replace the bearings to be sure it doesn't leak again in six months , as it is all a bitch of a job.
regards Philip A



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