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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I've had the same problem from 75-80mph with it getting worse the faster you go. I've had the drive shaft check and new joints, checked both axles (one bent and replaced) changed trans clutch, flywheel this afternoon. Its better but still there. I'm considering putting my dog bone back on. The input shaft to my old trans had play in it, both in and out and up and down. I'm puzzled too.