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OK, a few weeks ago I swapped the rear wheels with some donor's drove car, seemed to fix. So we just put new Bridgestone Potenza R-11a on the car, high speed balanced. On drive home...drone and vibration develops. AAAARRGGHHHH!
The three and half year old heat cycled out Direzza's needed replacing anyway, so that's OK.
This leaves alignment (the car tracks well and brakes straight and isn't twitchy), rear calipers (they release fine), half shafts, front and rear wheel bearing replace (fronts were done less then 10k ago and all are adjusted properly) and half shafts/axles, which co-incidentally were replaced by a shop that did shonky work a few months before this problem presented itself.
Any other ideas? This is getting time con$uming.
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