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Home >> GMC >> 1990 >> Value Van 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> 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.