I just had the trans gone over and upgraded took the car out and ran it no problems now it only has 12K miles on it. The problem is now it has a shimmy to it at anything over 100 MPH the only thing I did was added 3pt UMI subframe bolt on, lower control arm and lower control arm relocating brackets. Now I have the vibration could it be the relocating brackets? or the subframe it never had a vibration before, I checked no U joints are bad either anyone else ever have this problem. I am think of taking the relocating brackets off and see if that stops the problem. Any suggestions???