I have a vibration between 55and70 and it's
severity changes. Any time and I have not been
able to tell what changes it or why.
FIRST THING I WOULD CHECK IS TO SEE IF A TIRE HAS COME APART..THEN A WHEEL BALANCE/BENT RIM...A DRIVE SHAFT..LOOSE CONVERTERauto..HARMONIC BALANCER
Take it in and have the front end checked out to know what the problem is.
Search Ford Mustang Questions
Ford Mustang Experts