Interesting wear on the gear cluster end. I expect that it has worn
through the (presumably) harden wear surface to the softer material
underneath. At a minimum I would fit a hardened shim to bring the
surface level again.
Looks like odd surface marking on the inner solid bushing as well. Is
it just brass or is it oilite material? They make a kit for the big TR
gearbox so two bearings can be installed on each end of the gear
cluster. The problem would be to find a caged roller with a race that
would fit (McMaster-Carr?). You would need to turn the gear cluster to
fit the outer diameter of the new bearing. That is not an easy job
either as the surface of the cluster is hardened to be a bearing race
for the loose needle bearings. Please note that if you are using loose
bearings they come in packs of 50 but you only use 49 of them.
I would not use the chipped cluster. Too much surface area is missing
and the harden surface remaining may be detaching form the body.
There was a time when there were some counter shafts that were of
inferior quality as well. I don't know if that is still the case but I
certainly would not purchase parts from "The lowest bidder" regardless.
Your best bet would be to find a good replacement cluster but GT6 trans
parts are few and far between.
Please note I am not a professional transmission mechanic, just lending
my opinion based on personal Triumph experience over the years.
Edward Hamer
Petaluma CA
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