You know what, I have the same problem, only mine has progressed to a ticky noise as I drive, and goes away when i push the clutch to the floor. just had my clutch replaced, throwout bearing done, and flywheel lightened. the problem is still there, and I think its the input shaft bearing on the transmission, which im not looking forward to. tell me if you take yours in what they say it was, its irritating as HELL.