OK... 1989 GMC 1500 with 305. There is a weird ring coming from right around the flexplate. kinda like having a marble in your hubcap. mot when engine is cold but after a couple of minutes. Took the cover off to see if they were hitting still there. Inspected for loose bolts cracks. Nothing. disconnected torque converter, still there. removed tranny, still there. removed flexplate, cannot start engine to see if still there. no cracks, broken welds in plate but if I hit it with a wrench like a dinner bell I can detect a faint rattle. suspect it may be the ballance weight. I mean FAINT rattle but rattle none the less. None of the tack welds on the balance look broken. I was thinking of packing JB weld or something under the balance to secure it. Any better ideas? How sensetive is the plate to minute weight changes.