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Clunking and grinding noise high reving in 1st and 2nd

  172 Cup
Usually kicks in at about 5000 rpm. Can happen whilest driving in a straight line or going round a corner. Think it happened the other night when I held the car using the foot brake on a hill whilst it was raining and then straight onto the accelerator pedal and wheel spun up the hill. Anyone know what the problem is and how serious it could be?
  172 Cup
If i'd knacked the gear box wouldn't it clunk and grind no matter how many revs i was doing?