If the end of the main shaft that fits inside the input shaft is badly worn, then the pilot tip will want to wander and cause the pilot bushing to wear quickly. This is true even if the shaft endplay is zero. Fifth gear on the main shaft is outside the case. Thus, it uses the rear case bearing as a fulcrum. First through 3rd gears, being INSIDE the case do not have the same leverage. Fourth is direct drive, so no leverage there.
Also, if the main shaft bearings (or counter shaft bearings) are badly worn, I think that would cause it to whine. Especially so in 5th gear, but I’d think all gears would whine a little.
If your T5 has not been inspected and the whine continues or comes back, you’ll need to open and inspect it.
Last edited by Lugnutz; 08/20/2018 10:32 AM.
