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Home >> GMC Truck >> 2002 >> K 3500 Truck 4WD V8-8.1L VIN G >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Sensors and Switches - Transmission and Drivetrain >> Sensors and Switches - A/T >> Transmission Position Sensor/Switch >> Service and Repair >> Allison - Automatic Transmission

Allison - Automatic Transmission

Park/Neutral Position Switch Replacement

Removal Procedure

Caution: Refer to Banery Disconnect Caution in Service Precautions.





1. Disconnect the external wiring harness from the PNP switch.
2. Disconnect the shift linkage/cable from the shift lever (2) on the selector shaft (4).
3. Use wrench (1) to prevent the shift lever (2) from rotating. Remove nut (3) from the end of the selector shaft (4). Carefully remove the shift lever (2) from selector shaft (4).
4. Remove the two bolts (6). Remove the PNP switch (5) by sliding it outward over the selector shaft (4).

Installation Procedure





1. Be sure that the neutral assurance bracket (2) is in the proper position on PNP switch (1).
2. Make sure the selector shaft is in the N (Neutral) position as follows:
^ Place a wrench on the selector shaft flats and rotate the shaft to its furthest clockwise position.
^ Rotate the selector shaft two detents.





3. Align the PNP switch (5) with the main housing so that the neutral assurance bracket is facing outward.
4. While maintaining the correct PNP switch-to-selector-shaft alignment, slide the new PNP switch (5) over the selector shaft (4).

Notice: Refer to Fastener Notice in Service Precautions.

5. While holding the neutral assurance bracket in engagement with the PNP switch, install the two bolts (6) so that the PNP switch may be rotated with some effort.
^ Tighten the two bolts (6) to 27 Nm (20 ft. lbs.).
6. Remove and discard the neutral assurance bracket.

Notice:
^ DO NOT drive the selector lever onto the selector shaft.
^ DO NOT use an impact wrench in order to tighten the selector lever nut. Hold the lever with a wrench while tightening the nut.
^ Failure to follow these instructions may result in transmission damage.

Notice: Refer to Transmission Selector Shaft Abuse Notice in Service Precautions.

7. Reinstall shift lever (2). Install nut (3), by hand, on the end of selector shaft (4). Use a wrench (1) to keep the shift lever from rotating.
^ Tighten nut (3) to 24 Nm (18 ft. lbs.).
8. Reconnect the shift selector linkage/cable to the shift lever (2).
9. Connect the external wiring harness to the PNP switch.
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