Chevrolet Silverado / GMC Sierra. Service manual — part 929

Fig. 300: Identifying Fiber Clutch Plate Measurement Locations
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

Measure as described below at a minimum of 3
locations.

Replace any 4-5-6 clutch fiber plate that does not meet
specifications.

2008 Chevrolet Silverado 1500

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

Silverado

1. Measure the thickness of each 4-5-6 clutch fiber plate (1) at dimension A.

Specification: The 4-5-6 clutch fiber plate minimum thickness is 2.375 mm (0.0935 in).

2. Measure the 4-5-6 clutch fiber plate oil groove depth of each plate at dimension B.

Specification: The 4-5-6 clutch fiber plate minimum groove depth is 0.200 mm (0.0079
in).

STEEL 4-5-6 CLUTCH PLATE INSPECTION

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 301: Measuring Thickness Of 4-5 Clutch Steel Plate
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

Measure as described below at a minimum of 3
locations.

Replace any 4-5-6 clutch steel plate that does not meet
specifications.

2008 Chevrolet Silverado 1500

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

Silverado

1. Measure the thickness of each 4-5-6 clutch steel plate (1) at dimension A.

Specification: The 4-5-6 clutch steel plate minimum thickness is 2.135 mm (0.0841 in).

Fig. 302: Measuring Cone Of Clutch Steel Plate
Courtesy of GENERAL MOTORS CORP.

2. Measure the cone of each 4-5-6 clutch steel plate (1) at dimension A.

Specification: The 4-5-6 clutch steel plate maximum cone is 0.240 mm (0.0094 in).

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

Tools Required

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

J 36850 Transjel® Lubricant. See Special Tools.

J 44525 Clutch Backing Plate Selector. See Special Tools.

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

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

Assemble

IMPORTANT: Check the steel plates for coning on a level surface.

2008 Chevrolet Silverado 1500

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

Silverado