Chevrolet Silverado / GMC Sierra. Service manual — part 865

Fig. 88: Detent Spring Assembly
Courtesy of GENERAL MOTORS CORP.

7. Install the detent spring assembly (2) onto the control valve assembly. Confirm that the

roller of the detent spring assembly rests on the detent lever (1).

8. Attach the IMS connector on the internal harness to the IMS.

9. Install 2 detent spring bolts (3).

Tighten: Tighten the bolts to 12 N.m (108 lb in).

10. Install the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement.

11. Connect the external wiring harness to the transmission main connector.

2008 Chevrolet Silverado 1500

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

Silverado

12. Perform the FastLearn procedure. Refer to FastLearn Procedure.

TORQUE CONVERTER FLUID SEAL REPLACEMENT

Tools Required

J 24171-A Seal and Dust Shield Remover

J 43772 Torque Converter Seal Installer. See Special Tools.

Removal Procedure

IMPORTANT: The FastLearn, adapt, procedure must be performed. This

can be done in 1 step using a scan tool. If this procedure is
not done, the TCM adaptive values will be at the settings that
it learned for the old components and will be in slow
adaptive mode. Under these conditions, it will take an
unacceptably long time for the adaptive values to converge
to levels suitable for the new transmission.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 89: Removing Torque Converter Seal Using J 24171-A
Courtesy of GENERAL MOTORS CORP.

1. Remove the torque converter from the transmission. Refer to Torque Converter

Replacement.

2. Obtain J 24171-A and install the tip (3) with a 90 degree hook onto the end of the slide-

hammer (1).

3. Position the 90 degree hook behind the rear face of the seal outer case (2). Remove the

torque converter seal using the slide-hammer.

4. Inspect the seal bore for scratches. Remove any scratches in the seal bore using crocus cloth.

2008 Chevrolet Silverado 1500

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

Silverado

Installation Procedure

Fig. 90: Installing New Seal Onto J 43772
Courtesy of GENERAL MOTORS CORP.

1. Install the new seal (2) onto the J 43772 . See Special Tools. Position the seal so the seal

lip is outward and the face of the steel case is against the driving face (1) on the tool.

2008 Chevrolet Silverado 1500

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

Silverado