My gearbox seems to be dying on me. I'm at about 120k miles now. It sounds like a bearing failure (in neutral and at idle and with the clutch pedal up (so the mainshaft is turning) it sounds like marbles in the tranny, with the clutch pedal down it disappears). I guess it's the input shaft bearing at least. So I'm preparing a full rebuild over the winter season. Try to organize the parts in the meantime (from the US and Japan as some parts are discontinued in the US).
- new clutch (full kit 91)
- new big bearings
- maybe selected synchros and gear hubs
- maybe shift forks
- adding Type R diff plate
- gaskets and o-rings
All good with the gearbox except the noise and it popped out of 5th once. It has been rebuilt at 50k miles with new bearings and synchros (went with the shorties/4.23 then). So I don't know if I should replace everything all over again. This rebuild should last more than 100k miles. I know I'll only be able to inspect it in detail as soon as the box is open. But maybe someone can give me a hint what to change for sure. Thanks!