i have a 2000 mustang with a terrible vibration when im going between 40-60 mph. i took it to a shop and got the tires balanced, I was also going to get an alignment but my rack and pinion mount bushings were offset and needed to be replaced before i get the alignment. i got the bushings but have yet to replace them cause there is no play in the steering and the steering feels fine...im pretty stumped on what the problem could be and many of my friends are too. any help or ideas would be much appreciated.