Hi there, i own a 1991 mitsubishi l200 pickup truck. I've had the clutch disk and cover replaced recently and now whenever i'm in neutral there is a rattling/chattering or knocking sound from the gearbox. It goes away when i disengage the clutch or if i raise the rpm's to about 1k+.
should have changed all the clutch parts, could be throw out bearing or pilot bearing. Most guys put in a whole kit to make sure nothing goes wrong in that big job
also had all the bearings in the gearbox including the release bearing replaced.