I had the grinding problem the last time I was at the track, course mine was grinding the whole day. Turns out the pressure plate had worn uneven, so the clutch wasn't fully disengaging. I put in a new clutch and everything was fine. If you were doing big burnouts you might have burnt your clutch, or it was just hot the last couple times you raced. I'd definitely check that before replacing the trans. Just a thought.
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