Hello i need some help or recomendations of good repair place. My 68 mustang has a bad vibration at about 65 mph. kind of goes away at 70 but comes and goes between 60 and 70. I have replaced so far shocks, transmission mount, had the wheels ballanced, and yesterday i brought original drive shaft to mesa driveshaft to balance and they informed me that the rubber seal was bad and slipping and i needed a new one. I dropped 280.00 on new one hoping that would solve and still vibrates same. What else should i check? I would like to get front looked at to rule out any issues but do not know a good place to take that wont try and rake me over. I do not think it is the rear bearings but guess could be. any ideas would be appreciated,