Sierra 1500 4WD V8-6.0L (2007)
Transmission Position Switch/Sensor: Service and Repair
Allison - Automatic Transmission
Manual Shift Shaft, Detent Lever, and Position Switch Assembly Replacement
Removal Procedure
1. Remove the control valve assembly from the transmission.
Important: The detent lever/IMS retaining bolt contains patch lock material on the threads. Do not reuse the retaining bolt.
2. Remove the detent lever/IMS retaining bolt (1) using a T27 TORX(R) bit and discard the retaining bolt.
Notice: DO NOT mar the transmission case surface around the spherical pin when removing or installing the spherical pin. An unmarred surface is
required to maintain the seal between the control valve assembly and the transmission case.
Notice: DO NOT twist the spherical pin when removing the pin from the transmission case. Damage to the transmission case can occur.
3. Place a protective plate on the transmission case surface around the spherical pin (3). Remove the spherical pin (3) from the transmission case.
4. Slide the manual shift shaft (5) through the detent lever/IMS assembly (4) and through the manual shift shaft seal.
5. Rotate the detent lever/IMS assembly to disengage the park pawl apply assembly (2). Remove the detent lever/IMS assembly (4).
Installation Procedure
