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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.
In my 1990 LX 5.0, at 2500-3500 RPMs, you can feel a vibration throughout the car. It only happens within this rpm range. Above that, its smooth and below it, its smooth. I'm thinking its just the harmonic balancer or maybe the fan clutch?</P>