Chevrolet Silverado / GMC Sierra. Service manual — part 944

Fig. 349: Measuring Clutch Backing Plate Dimension
Courtesy of GENERAL MOTORS CORP.

1. Measure the thickness of the 2-6 clutch backing plate at dimension A.

Specification: The 2-6 clutch backing plate minimum thickness is 15.400 mm (0.6063 in).

IMPORTANT: Perform the following measurements at 3 or more locations.

2008 Chevrolet Silverado 1500

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

Silverado

2. Measure the cone of the 2-6 clutch backing plate.

3. Replace the backing plate (1) if any cone is present.

LOW AND REVERSE CLUTCH PLATE INSPECTION

Fig. 350: Low and Reverse Clutch Plate Measurements
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

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

Silverado

1. Measure the thickness of each low and reverse clutch fiber plate (1) at dimension A.

Specification: The low and reverse clutch fiber plate minimum thickness is 2.375 mm
(0.0935 in).

2. Measure the oil groove depth of each low and reverse clutch fiber plate (1) at dimension B.

Specification: The low and reverse clutch fiber plate minimum groove depth is 0.200 mm
(0.0079 in).

Fig. 351: Checking Low And Reverse Clutch Fiber Plate Cone
Courtesy of GENERAL MOTORS CORP.

3. Measure the cone of each low and reverse clutch fiber plate (1) at dimension A.

Specification: The low and reverse clutch fiber plate maximum cone is 0.225 mm (0.0089
in).

IMPORTANT:

Perform the following measurements at 3 or more
locations.

Check the plates for coning on a level surface.

Replace any parts not meeting specifications.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 352: Measuring Low And Reverse Clutch Steel Plate Thickness
Courtesy of GENERAL MOTORS CORP.

4. Measure the thickness of each low and reverse clutch steel plate (1) at dimension A.

5. The minimum thickness is listed in Selective Components Specifications .

LOW AND REVERSE CLUTCH BACKING PLATE INSPECTION

2008 Chevrolet Silverado 1500

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

Silverado