Chevrolet Silverado / GMC Sierra. Service manual — part 934

2. Try to slide the tabbed end of J 44525-4 selector tool (1) into the retaining ring groove

on the turbine shaft.

3. If a tab fits into the retaining ring groove, record the 4-digit ID number located on the

tab of J 44525-4 selector tool (1). Refer to Selective Components Specifications to
determine the correct backing plate.

57. Select a 1-2-3-4 clutch backing plate as follows:

If no tab of J 44525-4 selector tool (1) fits into the retaining ring groove, select the 1-
2-3-4 clutch backing plate with ID No. 2420.

If one or more tabs of J 44525-4 selector tool (1) fit into the retaining ring groove,
select the 1-2-3-4 clutch backing plate with an ID No. corresponding to the highest
number recorded in the previous step.

58. Remove J 44525 from the turbine shaft. See Special Tools.

IMPORTANT: At most, 2 of the different tabs will fit into the retaining

ring groove.

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 316: View Of 1-2-3-4 Clutch Backing Plate
Courtesy of GENERAL MOTORS CORP.

59. Align the selected 1-2-3-4 clutch backing plate (3) so that the beveled edge of the backing

plate is facing up.

60. Install the 1-2-3-4 clutch backing plate (3) onto the turbine shaft (4).

61. Install the retaining ring (2) onto the turbine shaft (4).

62. Lift the 1-2-3-4 clutch backing plate (3) and install the spiral retaining ring (1) into the 1-2-

2008 Chevrolet Silverado 1500

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

Silverado

3-4 clutch backing plate (3).

Fig. 317: Locating 1-2-3-4 Clutch Thrust Bearing Assembly & Turbine Shaft
Courtesy of GENERAL MOTORS CORP.

NOTE:

Installing the thrust bearing assembly onto the rear of the
turbine shaft in the wrong direction may cause permanent
damage to the transmission. The blue stripe must be visible.

2008 Chevrolet Silverado 1500

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

Silverado

63. Align thrust bearing assembly (2) so that the blue stripe on the thrust bearing assembly is

facing away from turbine shaft (3).

64. Install the thrust bearing assembly (2) into the turbine shaft (3).

65. Make sure the blue stripe on the thrust bearing assembly is visible.

66. Center the 1-2-3-4 clutch plates (4).

67. Install the 1-2-3-4 clutch drive hub (1) over the 1-2-3-4 clutch plates (4).

68. Make sure the 1-2-3-4 clutch drive hub (1) has seated on the thrust bearing assembly (2).

2008 Chevrolet Silverado 1500

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

Silverado