Chevrolet Silverado / GMC Sierra. Service manual — part 765

MANUAL SHIFT SHAFT AND SEAL REPLACEMENT

Fig. 78: Manual Shift Shaft and Seal Replacement
Courtesy of GENERAL MOTORS CORP.

Lubricate the seal with clean transmission fluid.

Use the J 38693 Seal Installer, to install the seal. See Special Tools.

Callout

Component Name

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the transmission from the vehicle. Refer to Transmission Replacement.

3. Remove the transmission fluid pan. Refer to Automatic Transmission Fluid, Fluid

Pan and/or Filter Replacement.

4. Remove the control valve body. Refer to Control Valve Lower Body and Upper

Body Replacement.

Manual Shift Shaft Pin
Tip:

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

MANUAL SHIFT DETENT LEVER AND PARK PAWL ACTUATOR
REPLACEMENT

Fig. 79: Manual Shift Detent Lever and Park Pawl Actuator Replacement

1

Discard the pin. Replace with NEW pin.

"Walk" the pin out using side cutters.

2

Manual Shaft Detent Lever Hub Pin
Tip:

Discard the pin. Replace with NEW pin.

"Walk" the pin out using side cutters.

3

Manual Shift Shaft
Tip: The manual shaft must be removed to replace the manual shaft seal.

4

Manual Shift Shaft Seal
Tip:

Use the J 45201 Cooler Line Seal Remover, to remove the seal from the
transmission case. See Special Tools.

Use the J 43909 Selector Shaft Seal Installer, to install the seal into the
transmission case.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Courtesy of GENERAL MOTORS CORP.

MANUAL SHIFT SHAFT POSITION SWITCH REPLACEMENT

Callout

Component Name

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the transmission fluid pan. Refer to Automatic Transmission Fluid, Fluid

Pan and/or Filter Replacement.

3. Remove the manual shaft detent assembly roller. Refer to Control Valve Lower

Body and Upper Body Replacement.

IMPORTANT:

Do not remove the park pawl or park pawl spring. The park pawl and park pawl spring are not
serviceable components.

1

Manual Shaft Detent Lever Hub Pin
Tip:

Discard the pin. Replace with NEW pin.

"Walk" the pin out using side cutters.

2

Manual Shift Shaft Pin
Tip:

Discard the pin. Replace with NEW pin.

"Walk" the pin out using side cutters.

3

Manual Shift Shaft

4

Manual Shaft Detent Lever Assembly

5

Park Pawl Actuator Assembly

6

Park Pawl Actuator Guide Pin
Tip:

Discard the pin. Replace with NEW pin.

"Walk" the pin out using side cutters.

7

Park Pawl Actuator Guide

8

Park Pawl Actuator Guide (O-Ring) Seals (Qty: 2)
Tip: Discard the seals. Replace with NEW seals.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 80: Manual Shift Shaft Position Switch Replacement
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the transmission fluid pan and filter. Refer to Automatic Transmission

Fluid, Fluid Pan and/or Filter Replacement.

1

Manual Shift Shaft Position Switch Assembly Electrical Connector
Tip:

Release the connector lock before disconnecting. Engage the connector
lock after connecting.

The wiring harness clip near the connector does not need to be replaced if
broken or missing. The clip is used during manufacturing to keep the wire
harness clear during an automated bolt installation process. If the clip is
damaged, simply remove and discard.

Manual Shift Shaft Position Switch Assembly Bolt

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado