Question about 2003 Ford Mustang

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Speedomoter reads consistenly 8miles per hour fater than i am actually going.

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Check your tire size. This problem will happen if you go from a "70" series to a "60" series tire. It can happen going from a "15" inch to a "14" inch wheel.

Some mustangs had an odd "15.5" wheel and you would get the same problem going to a "15" inch.

There are electronic programmers to reset the speedometer. Check a good Tire store. Or you may have to change the speedo drive gear and get the next size with an extra tooth.

Posted on Sep 23, 2009

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