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Re: Speedometer reading wrong???
what size are the front tires?
also the speedometer on most GM vehicles are of the air-core design. This is a moving needle operated by a magnetic coil. Since there is no direct mechanical connection, there is some variation in accuracy that cannot be eliminated.
here are some variations at different speeds
20mph variation 4
45mph variation 3
65mph variation 2
according to GM specs any air-core speedometer which reads within these limits should not be returned for service.
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