Chevrolet Silverado / GMC Sierra. Service manual — part 989

14. Install the short-threaded end of the transmission external oil filter adapter (6) into the

converter housing by hand.

Tighten: Tighten the adapter to 30 N.m (22 lb ft.)

15. Install the magnet (7) onto the transmission external oil filter adapter.

16. Lubricate the gasket on the transmission external oil filter (8) with transmission fluid.

17. Install the transmission external oil filter by hand until the gasket on the filter touches the

converter housing.

18. Using J 45023 (9) or by hand, turn the filter ONE FULL TURN ONLY. See Special

Tools.

19. Install the line pressure test hole plug O-ring (4) onto the line pressure test hole plug (5).

20. Install the plug.

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

21. Install the torque converter housing access hole cover (10).

22. If present, install the O-rings (3) onto the transmission oil cooler pipe connectors (2).

23. Install 2 transmission oil cooler pipe connectors (2).

Tighten: Tighten the connectors to 25 N.m (19 lb ft).

TWO-WHEEL-DRIVE LOW AND REVERSE CLUTCH HOUSING SPACER MEASUREMENT

end of the filter adapter is installed, the threads of the
converter housing will be damaged.

NOTE:

Refer to Component Fastener Tightening Notice .

NOTE:

Turning the transmission external oil filter more than ONE
FULL TURN after gasket contact will damage the filter.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 497: Dimension A
Courtesy of GENERAL MOTORS CORP.

1. Position the transmission case so that the rear of the case is facing up.

2. At dimension A, measure the distance from the rear face of the low and reverse clutch

housing (1) to the rear face of output speed sensor (OSS) reluctor wheel (2).

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 498: Dimension B
Courtesy of GENERAL MOTORS CORP.

3. At dimension B, measure the distance from the rear face of the low and reverse clutch

housing (3) to the rear face of the retaining ring (4).

4. Calculate Dimension C by subtracting Dimension B from Dimension A.

5. Select the appropriate selective spacer (1) based upon Dimension C. Refer to Selective

Components Specifications .

6. Install the selective spacer (1) onto the output shaft (2).

FOUR-WHEEL-DRIVE LOW AND REVERSE CLUTCH HOUSING SPACER MEASUREMENT

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 499: Identifying Selective Spacer Dimension A - 4WD
Courtesy of GENERAL MOTORS CORP.

1. Position the transmission case so that the rear of the case is facing up.

2. At dimension A, measure the distance from the rear face of the low and reverse clutch

housing (1) to the rear face of the bearing spacer (2).

2008 Chevrolet Silverado 1500

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

Silverado