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GMC
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1991
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Forward Control 6.2 J, Automatic
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Repair and Diagnosis
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Accessories & Equipment
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Gauges & Instrument Panels
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Instrument Panel - Except C/K Series Pickups
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Vehicle Speed Sensor (VSS) & Digital Ratio Adapter Controller (DRAC) Test
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Speedometer & Odometer Are Inaccurate
Speedometer & Odometer Are Inaccurate
Ensure correct DRAC is installed.