I had my tranny swaped in my 69 mustang (T-5), but I have not idea which flywheel was installed during the exchange. I read the article in this website, and it says that if you install a newer 50 oz flywheel, that your engine will vibrate to death. Just how hard is this vibration? I have driven my mustang ever since, and it seems fine, but my mechanic does not remember which flywheel he installed, and I do not want to take down the tranny to check. Any way to quick check you guys?