INFO. ON MANUAL TRANSMISSION SHIFT INDICATOR LIGHT. Chevrolet Blazer

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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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.