When driving my M6 and i shift at like 2-3,000 rpm it seems my tranny makes a really weird grindy noise, but it only does it in 2, and 3rd gear, sometimes 4th too, I know the guy before me put a new clutch in it, the thin shield under here also doesnt have all of its bolts on it, so i was also wondering if dirt and different grime has got up in there, messing up the clutch? Also could it be a pilot bearing or does anyone have any edvice for me?? Thanks for the help, Greg