Chevrolet Silverado / GMC Sierra. Service manual — part 843

Fig. 17: Yoke Assembly
Courtesy of GENERAL MOTORS CORP.

1. Place the transmission in the Park (P) selector position.

2. Apply the parking brake and chock the wheels to prevent vehicle movement.

3. Remove the vehicle driveline from the transmission yoke assembly (1). Refer to

Transmission Replacement.

Remove the bolt (3) and seal-ring washer (2).

CAUTION: Apply the parking brake and block the drive wheels

before performing this procedure in order to prevent
bodily injury.

2008 Chevrolet Silverado 1500

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

Silverado

4. Remove the yoke assembly (1).

5. Inspect the yoke assembly and replace it whenever there are nicks or scratches on the seal

journal or on the lead-in chamfer just ahead of the seal journal.

Installation Procedure

IMPORTANT: Do the following prior to installation of the yoke assembly:

Be sure the yoke, output shaft and retaining hardware
are clean.

Verify the output seal is free of tears or cuts.

DO NOT attempt to remove scratches from the output
seal journal on the yoke assembly. Repair may produce
machine lead and leakage.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 18: Yoke Assembly
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the internal splines and the rear seal journal of the yoke assembly with clean

transmission fluid.

2. Install the yoke assembly (1) onto the transmission output shaft.

3. Install the bolt (3) and seal-ring washer (2).

Tighten: Tighten the bolt to 123 N.m (91 lb ft).

4. Attach the vehicle driveline to the transmission yoke assembly. Refer to Transmission

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

Silverado

Replacement.

5. Be sure the selector is in the Park (P) position.

6. Remove the wheel chocks before continuing operation of the vehicle.

TORQUE CONVERTER REPLACEMENT

Tools Required

J 21366 Converter Holding Strap

J 46409 Torque Converter Lifting Handles. See Special Tools.

J 44723 Transmission/Stand Adaptor Plate

Removal Procedure

Fig. 19: Torque Converter Restraining Device
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

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

Silverado