Looks like the 1 pc did not solve my problem, it only shifted it to a higher rpm. it now vibrates at 80mph and over which i suspect is 1/2 the actual critical speed. I took a road trip yesterday and the drive was enjoyable except at 80mph and over. Suffice to say i kept it 70 mph most of the time. I am gonna try to fix the 2 pc oems or maybe buy a GR heritage front half.