I have the t-45 transmission and recently it has started grinding on occassion in 4th and 5th gear and only like once in second. Then just a couple days ago i have a rattle but its only in 4th that i hear it. You can tell its metal. It sound like something bouncing around inside it but once i hit 5th or 3rd it will disappear. It dont always do it but when it does its only 4th. What could it be? Clutch? Syncros? Gears or shifting forks??
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