Have you verified that its a wheel/tire problem as opposed to something else in the driveline?
To do this, take the car out and get it up to the same rpm that the vibration occurs at in 5th, but keep it in another gear, (i.e. 4th), if you dont have the vibration at the new speed, its the tires/suspension, if the car starts vibrating again in 4th, theres something wonky in the driveline.
Hope this helps,
J
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'66 Mustang Coupe- AKA "Lenore" *on disability for a (long) bit*
'93 GT Mostly stock AKA "Fawkes"
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