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I would bet on the tires. I had a 1994 that rode like a "truck" and put Michelin LT's on what a difference. On my 2003 2dr, I had 16000 miles on the tires and just changed them out to the Michelins. I had the same problem as you above 65 mph depending on the road surface. Checked everything could find nothing wrong, at 65 and below the truck was fine above that the whole truck vibrated. Changed the tires and can do 80 with no vibration. I guess it all depends on what you do/need tires for off road or highway. By the way the tires I took off were wranglers. Hope this helps.
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