I didnt want to put this in the FORD section so hopefully its ok to put it here. Im just trying to get some ideas from you guys on what would cause a pretty heavy vibration while driving my cougar. WHen I drove to Champaign recently I noticed a nice vibration that comes and goes for a few seconds. Im guessing the higher the speed the more noticable it becomes. It last for a few seconds then comes back every few miles. I noticed it anywhere from 40-65 mph. I really just need some ideas on where to start looking. Thanks