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Same boat as you.. practically everything new (bushings, tires, suspension, you name it), and I get that 70mph 'whip' motion, and high speed (very high speed) tail-wandering. It is possible these babies are very sensitive to alignment, but perhaps softer bushings are the way to go for absorbing some of that motion. I upgraded almost everything to poly.
Funny thing - my Supra has the same issues, but it also was upgraded to all poly-type suspension bushings.
You're not the only one!
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