Chevrolet Silverado / GMC Sierra. Manual — part 937

1. Remove the locating pin (1) from the rear surface of the transmission case.

2. Install a new locating pin (1) into J 43780 (2). See Special Tools.

3. Using J 43780 (2), drive the locating pin until seated. See Special Tools.

Locating Pin Installed Height: Make sure the locating pin is installed to a height of
20.80-21.20 mm (0.819-0.835 in) above the transmission case rear surface.

MANUAL SHIFT SHAFT, DETENT LEVER, AND POSITION SWITCH ASSEMBLY DISAS
DISASSEMBLE

Tools Required

J 43911 Manual Shift Shaft Seal Remover

Disassemble

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 325: Using J 43911 To Remove Shift Shaft Seal
Courtesy of GENERAL MOTORS CORP.

1. Position the transmission so that the valve body face of the transmission case is facing up.

IMPORTANT: 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

2008 Chevrolet Silverado 1500

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

Silverado

2. Remove the screw (3) from the body of J 43911 (2).

3. Screw the body of J 43911 into the manual shift shaft seal (1).

4. Install the screw (3) into the body of J 43911 (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 43911 (2).

Fig. 326: Detent Lever/IMS Assembly Retaining Bolt

2008 Chevrolet Silverado 1500

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

Silverado

Courtesy of GENERAL MOTORS CORP.

7. Remove the detent lever/IMS assembly retaining bolt (3) using a T27 Torx® bit and discard

the bolt.

IMPORTANT: The detent lever/IMS assembly retaining bolt contains patch

lock material on the threads. Do not reuse the detent
lever/IMS assembly retaining bolt.

2008 Chevrolet Silverado 1500

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

Silverado