C 1500 Truck 2WD V6-262 4.3L VIN Z (1992)
Shift Indicator: Technical Service Bulletins
M/T - Shift Indicator Light Application & Operation
GMC NUMBER:92-7B-99
GROUP: 7B Manual Transmission
DATE:
June 1992
CORPORATE
NUMBER: 249105
SUBJECT:
INFORMATION ON SHIFT INDICATOR LIGHT APPLICATION AND OPERATION
MODELS:
1992 C, K, P TRUCKS WITH 4.3L ENGINE (RPO LB4) AND MANUAL TRANSMISSION
Certain 1992 C, K and P 4.3L trucks do not make use of a shift indicator light:
The shift light is commonly used to achieve improved fuel economy, by prompting the driver when to upshift. Depending on which prom calibration is
installed in the ECM/PCM, the shift light can have the following characteristics:
-
Indicates proper shift point for maximum fuel economy.
-
Indicates engine over-rev (above 4000 rpm).
-
Shift light is inoperative.
Use chart to determine normal shift light operation for the vehicle in question.
