GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Transmission 🢒 Automatic Transmission - Allison 🢒 Manual Shift Shaft, Detent Lever, and Position Switch Assembly Disassemble

Special Tools

J 43909 Manual Shift Shaft Seal Remover

For equivalent regional tools, refer to Special Tools.


    Object Number: 1581020 Size: SH

    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. Object Number: 1581023 Size: SH

    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. Object Number: 1581024 Size: SH

    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. Object Number: 1581025 Size: SH

    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:
    11. • 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. Object Number: 1581026 Size: SH
  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).