My '86 GT5-S develops meaningful vibration at about 43 mph and above that speed begins to smooth out. Original 15" wheels and P7 tires in great shape. As the car was stored for many years I originally suspected flat spotted tires and I will shortly have the tires and wheels balanced. Flat spotting may be unrecoverable. I found slight left rear wheel bearing play, perhaps 1/8 to 1/4 inch. Other bearings are tight as a drum. Should I be looking at another source for the cause of the vibration? Please advise when able.
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