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Just posting this as an FYI.
Last fall my car started to make a bearing noise in 5th and 6th gear. I went through the google machine and found that this had happened to a few other people and on a couple of them, they mentioned the main shaft nut had come loose and the gears started to slide off the shaft. Well I had the car into a performance shop and they ripped it apart and found exactly that. The main shaft nut had loosened off and some gears were rubbing.. luckily I noticed the problem right away and stopped driving it until I had it looked at. The Damage was minimal to nothing. I had the shifter fork bearing replaced and the nut tightened and everything put back together and the car has been running flawless ever since.