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your synchros are going bad. This means the ring that makes the gear turn at the same speed as the shaft (the one attatched to the clutch) has gone bad, and the grinding is the synchro hitting the teeth, if you continue to shift fast, you will break the teeth off. if you rebuild now, you might not need new gears, just synchros. if you wait till it has shift problems, you will need new gears a.k.a. a new transmision
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