I have a 68 Mustang 200 CID automatic
I have a vibration that I feel in the floor pan, that is only felt while under power. I looked under the car and found nothing loose.
Any ideas what could be causing this?
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If the driveshaft is out of balance the vibration is speed sensitive. However, if the U-joints are out of phase(running a different angles front and rear) the frequency will be speed sensitive while the amplitude will be power sensitive. A change in the differential orientation (lower for instance) affects phase.