Chevrolet Silverado / GMC Sierra. Manual — part 1131
Specification:
Five plate - 0.99-2.14 mm (0.038-0.084 in)
Six plate - 0.90-2.10 mm (0.035-0.082 in)
Seven plate - 1.12-2.04 mm (0.044-0.080 in)
3. Select the proper 3rd and 4th clutch selective backing plate to obtain the correct travel.
Refer to Third and Fourth Clutch Backing Plate Selection .
CLUTCH AIR CHECK
Inspection Procedure
IMPORTANT: When the overrun clutch is checked, the air will blow by the
forward clutch piston lip seals and exit out of the forward clutch
feed hole in the turbine shaft.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 395: View Of Feed Holes
Courtesy of GENERAL MOTORS CORP.
Apply air into the feed holes in the turbine shaft in order to check the following items:
The 3rd and 4th clutch (1)
The forward clutch (2)
The overrun clutch (3)
TURBINE SHAFT SEAL INSTALLATION
Tools Required
J 36418-1B Turbine Shaft Seal Installer. See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
J 36418-2A Turbine Shaft Seal Sizer. See Special Tools.
Installation
Fig. 396: Identifying Turbine Shaft Oil Seal Rings
Courtesy of GENERAL MOTORS CORP.
1. Use the J 36418-1B (1) in order to install the four turbine shaft oil seal rings (619). See
Special Tools.
2. Resize oil seal rings (619) after installation:
1. Place J 36418-2A (2) over the turbine shaft oil seal rings (619) and seat against input
housing. See Special Tools.
2. Remove J 36418-2A (2). See Special Tools.
3. Turn J 36418-2A (2) upside down and place over the turbine shaft oil seal ring (619).
See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
4. Seat against input housing.
5. Leave J 36418-2A (2) in place over the turbine shaft oil seal rings (619) until the
reverse input clutch housing is installed. See Special Tools.
REVERSE INPUT CLUTCH DISASSEMBLE
Tools Required
J 23327-1 Forward Clutch Spring Compressor (Bridge). See Special Tools.
J 25018-A Clutch Spring Compressor Adapter. See Special Tools.
Disassemble
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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