has anyone figured this out? I have a 2002 deville base model. it is shaking now between 53mph all the way up it started very subtle and now it is to where when I hit 75-80 mph the whole car shakes so violently that the wheels come off the ground and they chirp and the car wants to spin out. it is a side to side shake and has just gotten worse and worse. ive replaced both front outer tie rods the passanger side inner tie rod and rotor, the power steering high pressure line, serpentine belt, tires, added rear spring spacers to resolve air assisted shocks not lifting the car, and brake lines. I took it to a local shop and was told the same inner tie rod was stripped from my outer tie rod being shoved in and well ofcourse that wasn't the issue. and they say I need two new front wheel bearing hubs. I never let anyone work on my cars and the shop telling me I needed a new inner and outer tie rod after I had just replaced it is exactly why I do my own work. but this shimmy/shaking/vibration what ever the hell u wanna call it is driving me absolutely nuts. so if anyone has any input on anything that's helps please speak up.

 

Kinda dumb question but is the tire balanced? Possibly broken cords in the tire itself causing it to oblong when at speed?