under normal highway cruising car runs perfectly smooth until at exactly 71 mph then a bad vibration really kicks in - i let off to about 68-69mph perfect again. feel thru steering wheel only and defintely is coming from front. thought it might be tierod or wheel bearing , but not sure. hoping...
does anyone know where to find the cause of this problem. is there a door sticking somewhere or a vac problem, check valve or something? any ideas or guidance would be appreciated.
thanks in advance , dave