Chevrolet Silverado / GMC Sierra. Service manual — part 938

Fig. 327: Placing Protective Plate On Transmission Case Surface
Courtesy of GENERAL MOTORS CORP.

8. Place a protective plate (1) on the transmission case surface around the spherical pin (2).

9. Remove the spherical tip pin (2) from the transmission case.

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.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 328: Manual Shift Shaft
Courtesy of GENERAL MOTORS CORP.

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)

IMPORTANT: 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.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

11. Remove the detent lever/IMS assembly (3) and the park pawl assembly (5) from the

transmission case.

Fig. 329: View Of Park Pawl Assembly And Detent Lever/IMS Assembly
Courtesy 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).

MANUAL SHIFT SHAFT, DETENT LEVER, AND POSITION SWITCH ASSEMBLY ASSEM
ASSEMBLE

Tools Required

J 43909 Manual Shift Shaft Seal Installer

Assemble

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 330: Installing A New Manual Shift Shaft Seal Using J 43909
Courtesy of GENERAL MOTORS CORP.

1. Install a new manual shift shaft seal (1) onto J 43909 (2).

2. Using J 43909 (2), drive the manual shift shaft seal (1) into the transmission case.

3. Make sure the manual shift shaft seal is seated on the bottom of the bore.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado