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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1355 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions - Off Vehicle >> Manual Shift Shaft, Detent Lever, and Position Switch Assembly Disassemble >> Disassembly Procedure

Disassembly Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Using J 43911 To Remove Shift Shaft Seal
    GM1581020Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not remove the manual shift shaft unless replacing one or more of the following:
    • Manual shift shaft
    • Detent lever/internal mode switch (IMS) assembly
    • Park pawl assembly
  1. Position the transmission so that the valve body face of the transmission case is facing up.
  2. Remove the screw (3) from the body of J 43909:  remover (2).
  3. Screw the body of J 43909:  remover into the manual shift shaft seal (1).
  4. Install the screw (3) into the body of J 43909:  remover (2).
  5. Tighten the screw (3) against the manual shift shaft until the manual shift shaft seal (1) becomes dislodged.
  6. Remove the manual shift shaft seal (1) from J 43909:  remover (2).
    7. Fig 2: Detent Lever/IMS Assembly Retaining Bolt
    GM1581023Courtesy of GENERAL MOTORS CORP.
    NOTE: The detent lever/IMS assembly retaining bolt contains patch lock material on the threads. Do not reuse the detent lever/IMS assembly retaining bolt.
  7. Remove the detent lever/IMS assembly retaining bolt (3) using a T27 Torx® bit and discard the bolt.
    8. Fig 3: Placing Protective Plate On Transmission Case Surface
    GM1581024Courtesy of GENERAL MOTORS CORP.
    CAUTION: DO NOT twist the spherical pin when removing the pin from the transmission case. Damage to the transmission case can occur.
  8. Place a protective plate (1) on the transmission case surface around the spherical pin (2).
    9. CAUTION: DO NOT twist the spherical pin when removing the pin from the transmission case. Damage to the transmission case can occur.
  9. Remove the spherical tip pin (2) from the transmission case.
    10. Fig 4: Identifying Manual Shift Shaft
    GM1581025Courtesy of GENERAL MOTORS CORP.
    NOTE: Burrs or raised metal where the manual shift shaft detent lever seats against the manual shift shaft may prevent the manual shift shaft from sliding from the transmission case. Use a file to remove burrs or raised metal from the manual shift shaft.
  10. While holding the detent lever/IMS assembly (3), carefully slide the manual shift shaft (1) through the following:
    • Detent lever/IMS assembly (3)
    • Manual shift shaft seal hole (2)
  11. Remove the detent lever/IMS assembly (3) and the park pawl assembly (5) from the transmission case.
    12. Fig 5: View Of Park Pawl Assembly & Detent Lever/IMS Assembly
    GM1581026Courtesy of GENERAL MOTORS CORP.
  12. Rotate the park pawl assembly (1) 180 degrees.
  13. Remove the nib of the park pawl assembly through the keyhole in the detent lever/IMS assembly (2).
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