Ron,
It is best to renew all chevron seals and gaskets.
The main bearings are usually OK, as they are permanently immersed in oil.
The bearings to check out are the needle roller bearings on the layshaft. If
there is any play on the shaft, then replace them, and potentially the shaft
itself, if there is sign of wear. You'll need to fabricate a 'dummy layshaft'
to reassemble. This is a shaft of the same (or slightly smaller) diameter as
the layshaft but shorter to allow the lay-gears to be inserted to the bottom
of the box fully assembled. You then push the dummy through with the real
layshaft. Tubing (even plastic) is good enough for the dummy.
The other are to check is the wear on the bronze slip-rings. If these are
worn, it will cause the box to pop out of gear, particularly in 1st or
second.
It is rare for the actual gears to sustain much wear on the all-synchro box.
Good luck.
Julian.
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