What did you ever do about wheel balance? I remember you have an issue. The reason I ask is a customer of mine just bought a scat Pak challenger and it has a horrible vibration. Dealer says no problem. Tire shop says Goodyear has a known problem with those tires and is doing nothing about it. He had a tire shop remount and turn tires on rims and re balance. He said it's better but still has a vibration around 60mph. I thought of your issue when he mentioned it.
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