I have rebuilt the entire font end of my 89 E24 includung 750 thrust arm (upper control arm) bushings. I replaced the trx rims and tires with M11's and Michelin 225/50/16 tires. I have replaced the rotors with Zimmerman rotors as well. Today I replaced the MM11 rims with the original trx rims/tires with NO difference. So, I guess it is not the rims. Should I replace the 750 bushings with the solid urethane ones from BMP? I am getting a shimmy when accelerating from 45 to 60 mph, and it is worse when braking. I am going to a driving school in 2 weeks, so I need to solve this problem ASAP Thanks Johnny