when i bought my formula i noticed that 3 of the 4 wheels had curb rash or bent lip. i had to travel a few hours to get home. while on the interstate i noticed a vibration. i stopped and had the car serviced and the wheels and tires balanced. well, i went on my way vibration and all. now, it seems to be very pronounced at speeds above 80. it is too the point of annoying to almost uncomfortable. could this possibly be the drive shaft or u joint. or, do you think it is the wheels. the car has been wrecked in the past. any suggestions? thanks

 

It sounds like the driveshaft