Chevrolet Silverado / GMC Sierra. Service manual — part 918

Fig. 263: View Of Oil Seal Assembly Retaining Bolts
Courtesy of GENERAL MOTORS CORP.

25. Install 10 bolts (1) into the converter housing to retain the oil pump cover module.

Tighten: In a criss-cross pattern, tighten the bolts to 56 N.m (42 lb ft).

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 264: Installing Pump Body Hub Oil Seal Assembly
Courtesy of GENERAL MOTORS CORP.

26. Align the oil seal assembly (2) with the oil pump body so that the double edges face the

pump body hub.

27. Using J 43772 , install the oil seal assembly into the pump body hub. See Special Tools.

2008 Chevrolet Silverado 1500

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

Silverado

Specification: The seal installed depth measurement is flush to 0.25 mm (0.010 in) below
the oil pump body surface.

1-2-3-4-5-6 CLUTCH PISTON HOUSING DISASSEMBLE

Tools Required

J 24204-2 Bar and Stud Assembly. See Special Tools.

J 43772 Torque Converter Seal Installer. See Special Tools.

J-47339-1 Piston Return Spring Compressor. See Special Tools.

J-47339-2 Seal Area Protector. See Special Tools.

Disassemble

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 265: View Of 1-2-3-4, 4-5 Clutch Housing Components
Courtesy of GENERAL MOTORS CORP.

1. Position the 1-2-3-4, 4-5-6 clutch assembly (4) on the work table so that the rear of the

assembly is up.

2. Remove the retaining ring (1) from the 1-2-3-4, 4-5-6 clutch assembly.

3. Remove the input sun gear (3) with the input drive flange (2) attached.

4. Remove the input sun gear from the drive flange.

2008 Chevrolet Silverado 1500

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

Silverado