Hi guys I have a r32 gtst it is mostly standard, now the box that was in the car was screwed not bye me so I got a used one from KYP in Perth and hyperdrive fitted it. But some times when I change into third and fourth it crunches and knocks but only when the box gets warm. I thought it might be the oil being to thin so I got thicker stuff and it's not as bad but still does it sometimes so I was wondering if it is bad to put to thick of oil because I might try thicker stuff.