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If you are convinced that your tires/wheels are not the cause, then you may want to look at tightening up your rack/pinion. I've been fighting a high frequency steering wheel shake what only occurred between 60 and 70MPH. My tires are not out of round and neither are my wheels. The entire front suspension was analyzed, and the root cause of the problem was that the steering rack adjustment was set a tad too loose. Once it was tightened up a bit, then high speed shake disappeared. Hope this helps...
YMMV,
Randy...
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