Erm...maybe u disenage the Clutch to fast...Which cause when u clutch in and change gear 2 to 3...before u successful enage to gear 3...u already clutch out liao....then clos those cracking sound...
Izzit...u trying to drive fast so act like a pro by quickily step full on accelerator and change gear and fast motion??

Anyway, try to change your gears fully to the end then clutch out...
