Chevrolet Silverado / GMC Sierra. Service manual — part 1057

J 43911 Selector Shaft Seal Remover. See Special Tools.

J 43909 Selector Shaft Seal Installer. See Special Tools.

Removal Procedure

Fig. 122: Sliding Seal Remover Tool Over Selector Shaft
Courtesy of GENERAL MOTORS CORP.

1. Remove the park/neutral position (PNP) switch. Refer to Park/Neutral Position Switch

Replacement.

2. Ensure that the jackscrew for J 43911 is backed off and will not interfere with installation

of the removal tool. See Special Tools. Slide the seal remover tool over the selector shaft
(2) with the threaded end of the tool towards the seal.

3. Rotate the removal tool so that the threads on the end of the tool engage the steel shell (1) of

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

the seal. Use a wrench to ensure that the removal tool is firmly attached to the seal shell.

4. Rotate the jackscrew in the clockwise direction to remove the seal from the bore. Discard

the seal that was removed.

Installation Procedure

Fig. 123: Sliding New Selector Shaft Seal Over Selector Shaft
Courtesy of GENERAL MOTORS CORP.

1. Carefully slide a new selector shaft seal (1) over the selector shaft (2) with the wide face of

the steel case facing outward. Position the seal so that it is starting to enter the seal bore.

2. Obtain J 43909 and remove the inner sleeve so that the tool will slide over the selector

shaft. See Special Tools.

3. Slide the J 43909 into position so that the end of the tool contacts the seal being installed.

See Special Tools. Use a mallet to strike the J 43909 and drive the new seal into the bore
until it is seated at the bottom of the bore. 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. Install the PNP switch. Refer to Park/Neutral Position Switch Replacement.

5. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to

Transmission Fluid Check.

VALVE BODY AND PRESSURE SWITCH REPLACEMENT

Removal Procedure

Fig. 124: Identifying Valve Body Electrical Components
Courtesy of GENERAL MOTORS CORP.

1. Ensure that removal of the valve body is necessary before proceeding.

The following components can be serviced without removing the valve body from the
transmission:

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

The torque converter clutch solenoid (1)

The pressure control solenoid (2)

The internal wiring harness (3)

The 2-3 shift solenoid (4)

The 1-2 shift solenoid (5)

The transmission fluid pressure manual valve position switch (6)

The 3-2 shift solenoid (7)

The torque converter clutch pulse width modulation (TCC PWM) solenoid (8)

2. Remove the fluid level indicator.

3. Remove the transmission filter. Refer to Automatic Transmission Fluid and Filter

Replacement.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado