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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel - Standard & Electronic >> Testing >> Speedometer/Odometer Testing >> Calibration Incorrect (P, R & V Series)

Calibration Incorrect (P, R & V Series)

Possible causes include incorrect transmission adapter box, incorrect drive gear or sleeve, over or undersize tires and faulty speedometer head.