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