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I have this same issue, mine will grind at about 5500 to 6000 RPM from 3rd to 4th, and only after the tranny is warmed up from about 10 min of driving.
Dealer said it was a Syncro issue and they are replacing the whole tranny.
It was fine until I hit the 10K mileage mark, prior to that this thing shifted perfectly smooth. (I don't race or track the car, or drive like ass).
My only worry is it creeping up again if this is some kind of design flaw.
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