Chevrolet Workshop Service and Repair Manuals > K 2500 Truck 4WD V8-454 7.4L (1988) > Powertrain Management | Transmission Control Systems | Sensors and Switches - Transmission and Drivetrain | Sensors and Switches - Transfer Case | Four Wheel Drive Selector Switch | Component Information | Technical Service Bulletins | All Other Service Bulletins for Four Wheel Drive Selector Switch: | 891271B | Apr | 89 | Component Information | Technical Service Bulletins | All Technical Service Bulletins for Four Wheel Drive Selector Switch: | 76-43-01A | Sep | 98 | Drivetrain - Slow Or No Engagement of Front Axle

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For 1993 and prior vehicles, splice into CKT 50 (BRN) between connector C152 and GT101 (Figures 2, 3, 4).