INFO. ON MANUAL TRANSMISSION SHIFT INDICATOR LIGHT. GMC Truck S15 Pickup - 4WD 1993

For 1990-2009 cars

# INFO. ON MANUAL TRANSMISSION SHIFT INDICATOR LIGHT

REVISION: 01/23/95

THIS BULLETIN IS BEING REVISED TO ADD THE 1995 MODEL YEAR. PLEASE DISCARD BULLETIN 367207 (GROUP REFERENCE 7 - TRANSMISSION). ----------------------------------------------------------------------

#### SUBJECT: INFORMATION ON MANUAL TRANSMISSION SHIFT INDICATOR LIGHT APPLICATION AND OPERATION

#### MODELS: 1993-95 CHEVROLET AND GMC TRUCK C/K AND S/T TRUCKS WITH MANUAL TRANSMISSION

CERTAIN TRUCKS ARE NOT EQUIPPED WITH A SHIFT INDICATOR LIGHT. THE SHIFT LIGHT IS COMMONLY USED TO ACHIEVE IMPROVED FUEL ECONOMY BY PROMPTING THE DRIVER WHEN TO UPSHIFT. DEPENDING ON THE ENGINE/TRANSMISSION INSTALLED IN THE VEHICLE, THE SHIFT LIGHT CAN HAVE THE FOLLOWING CHARACTERISTICS: - INDICATES PROPER SHIFT POINT FOR MAXIMUM FUEL ECONOMY. - INDICATES ENGINE OVER-SPEED. - SHIFT LIGHT IS INOPERATIVE.

THE FOLLOWING CHARTS DETAIL NORMAL SHIFT LIGHT OPERATION:

1993 FUEL ECON OVER-SPEED GVWR ENGINE SERIES TRANS SHIFT LIGHT SHIFT LIGHT

ALL 2.5L S MW1 YES YES ALL 2.8L S ML3 YES YES ALL 4.3L S/T MY2 YES YES UNDER 8500 4.3L FED C MG5 YES YES UNDER 8500 4.3L CAL C MG5 NO YES UNDER 8500 4.3L K MG5 NO YES UNDER 8500 4.3L C/K MT8 NO YES UNDER 8500 5.0L/5.7L C/K MG5 YES YES UNDER 8500 5.7L C/K MT8 YES YES UNDER 8500 ALL DIESELS C/K MT8 NO NO OVER 8500 4.3L C/K MT8 NO NO OVER 8500 5.7L C/K MT8 NO YES OVER 8500 ALL DIESELS C/K MT8 NO NO OVER 8500 7.4L C/K MT8 NO NO

1994 FUEL ECON OVER-SPEED GVWR ENGINE SERIES TRANS SHIFT LIGHT SHIFT LIGHT

ALL 2.2L S MW1 YES YES ALL 4.3L S/T MY2 YES YES UNDER 8500 4.3L C/K MG5 YES YES UNDER 8500 4.3L C/K MT8 NO YES UNDER 8500 5.0L/5.7L C/K MG5 YES YES UNDER 8500 5.7L C/K MT8 YES YES UNDER 8500 ALL DIESELS C/K MT8 NO NO OVER 8500 4.3L C/K MT8 NO NO OVER 8500 5.7L C/K MT8 NO YES OVER 8500 ALL DIESELS C/K MT8 NO NO OVER 8500 7.4L C/K MT8 NO NO

1995 FUEL ECON OVER-SPEED GVWR ENGINE SERIES TRANS SHIFT LIGHT SHIFT LIGHT

ALL 2.2L S MW1 YES YES ALL 4.3L LB4 S/T M50 YES YES ALL 4.3L L35 S/T M50 YES YES UNDER 8500 4.3L C/K MG5 YES YES UNDER 8500 4.3L C/K MW3 NO YES UNDER 8500 5.0L/5.7L C/K MG5 YES YES UNDER 8500 5.7L C/K MW3 YES YES UNDER 8500 ALL DIESELS C/K MW3 NO NO OVER 8500 5.7L C/K MW3 NO NO OVER 8500 ALL DIESELS C/K MW3 NO NO OVER 8500 7.4L C/K MW3 NO NO

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