Chevrolet Silverado / GMC Sierra. Manual — part 883

5. Firmly tighten the nut (6) in order to seal J 43763 into the torque converter.

6. Firmly tighten the nut (5) in order to securely attach the torque converter to J 21369-F (3).

See Special Tools. Connect an air hose to the air fitting (1) of J 43763 . See Special Tools.

7. Pressurize the converter to 517 kPa (75 psi) maximum.

8. Disconnect the air hose. Submerge the torque converter in water.

9. Closely observe the torque converter for bubbles that indicate leakage. If the torque

converter leaks, replace the torque converter.

10. Push on the pressure relief valve (2) of J 43763 and release the air from the torque

converter. See Special Tools.

11. Remove the J tools from the torque converter.

TORQUE CONVERTER INSPECTION

CAUTION: All pressure from the torque converter must be exhausted

before loosening the test fixture nut. Failure to relieve the
pressure could cause personal injury and/or property
damage.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 151: Checking Torque Converter Hub For Bushing Wear
Courtesy of GENERAL MOTORS CORP.

1. Measure the OD of torque converter hub (1) at dimension A, the bushing wear area.

Torque Converter Hub OD: Dimension A must equal or exceed 58.250 mm (2.293 in).

IMPORTANT: Replace the torque converter if it does not meet

specifications.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 152: Measuring Flats On Torque Converter Hub
Courtesy of GENERAL MOTORS CORP.

2. Measure the distance between the flats of the torque converter hub at dimension A.

Torque Converter Hub Flats: Dimension A must equal or exceed 51.816 mm (2.040 in).

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 153: Measuring Torque Converter Cover Pilot
Courtesy of GENERAL MOTORS CORP.

3. Measure the OD of the torque converter cover pilot at dimension A.

Torque Converter Pilot: Dimension A must equal or exceed 43.080 mm (1.696 in).

TRANSMISSION FLUID INSPECTION

2008 Chevrolet Silverado 1500

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

Silverado