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Home >> GMC >> 1994 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Operation >> Shift Light >> Manual Transmission

Manual Transmission

Depending on ECM/PCM prom calibration, shift light shows driver when to upshift for best fuel economy, or indicates engine RPM greater than 4000. Driver should disregard light during downshift.