Newly installed 6puk clutch, unsprung and clutch release bearing.. fitted 300km's ago. If you rev the car in neutral gets about 2k, you hear almost a grinding noise coming from the box.. If you depress the clutch and leave it in nuetral and rev the car, the noise isn't heard. Someone said clutch release bearing, but it's brand new?... Confused, annoyed.. 3 hours pulling the box out last week to happen all over again by the looks of it. It sounds horrendous, and last maybe 3-5 seconds sometimes considerably longer. Can get a video this evening.