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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> On-Vehicle Repair Information >> Manual Shift Shaft, Detent Lever, and Position Switch Assembly Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Detent Lever/IMS Retaining Bolt
    GM1633283Courtesy of GENERAL MOTORS CORP.
  1. Remove the control valve assembly from the transmission. Refer to Control Valve Body Replacement .
    2. 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® bit and discard the retaining bolt.
    3. NOTE: 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.
    NOTE: 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).
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