If your 15" wheels have tires mounted on them, then I would swap them out to see if the vibration goes away. That way you can confirm the tires as being the problem (or rule them out).
Not sure what you mean about the red line (Disclaimer: I have yet to finish my first cup of coffee this morning, so I may be a bit slow on the uptake of your wording). Can you attach a photos?
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Bill Jr.
To everyone out there, wherever you are. Remember, the light at the end of the tunnel may be the police chasing you down in their own Mustang!
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