I had very bad vibration at 50 and up. At 100 mph whole car was shacking but still ran 13.5. I tryed good know set of tires with no change. Someone change upper control arm bushings and I thought problem was somewhere else. I change all body bushings with upper solids, all new leaf springs bushing and still vibration. Finally I took lower control arms out. On a right side bushing was gone, only shell and pin were there. I install all new upper and lower moog ball joints with new bushings. Now even without alignment, worn out tie rods, center link and idler arm no more vibration. Check your control arm bushings.
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