my 98 chryler concorde has a something wrong with the steering system every time i take it to a mechanic they all tell me its the rack and pinion bushings i have had the bushing replaced 5 times now and they still come out, i cannot ride the express way because once you get to 60mph the car vibrates really bad, it shakes from side to side when im driving at a normal speed and the steering wheel is really loose as if the car needs a alignment, i already had a alignment done and it still does the same thing, please help.