Chevrolet Silverado / GMC Sierra. Service manual — part 767

INPUT AND OUTPUT SPEED SENSOR REPLACEMENT

Tighten in specified sequence.

Tighten: 8 N.m (71 lb in)

4

Control Valve Assembly

5

Fluid Pump Seal
Procedure:
Discard seal and replace with new.

6

Fluid Pump Seal
Procedure:
Discard seal and replace with new.

7

Center Support Fluid Passage Seal

Procedure

1. Discard seal and replace with new.

2. It is recommended that transmission adaptive pressure (TAP) information

be reset. Transmission performance may be affected as new TAP values
are learned. Refer to Service Fast Learn Adapts.

3. If replacing the control valve body assembly, remove the Control

Solenoid Valve and Transmission Control Module Assembly
Replacement and the Manual Shift Shaft Position Switch
Replacement.

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

Fig. 83: Input and Output Speed Sensor Replacement
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedures

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

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

TRANSMISSION CONVERTER COVER REPLACEMENT

Fig. 84: Transmission Converter Cover Replacement
Courtesy of GENERAL MOTORS CORP.

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

Fluid, Fluid Pan and/or Filter Replacement.

3. Remove the upper and lower valve body assembly. Refer to Control Valve Lower

Body and Upper Body Replacement.

1

Speed Sensor Electrical Connector

2

Input and Output Speed Sensor Assembly Bolts (Qty: 2)

Tighten: 12 N.m (106 lb in)

NOTE:

Refer to Fastener Notice .

3

Input and Output Speed Sensor Assembly Clips (Qty: 2)
Tip: Inspect the wiring harness clips for damage replace if necessary.

4

Input and Output Speed Sensor Assembly

Callout

Component Name

Preliminary Procedure:
Raise the vehicle. Refer to Lifting and Jacking the Vehicle .

Torque Converter Cover Bolt

2008 Chevrolet Silverado 1500

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

Sierra & Silverado

TRANSMISSION REPLACEMENT

TOOLS REQUIRED

J 21366 Converter Holding Strap

REMOVAL PROCEDURE

1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection

and Connection (w/Single Battery) or Battery Negative Cable Disconnection and
Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and
Connection (w/Dual Batteries) .

2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .

3. Remove the rear propeller shaft. Refer to One-Piece Propeller Shaft Replacement or

Two-Piece Propeller Shaft Replacement .

4. Support the transmission with a transmission jack.

5. Remove the transmission crossmember. Refer to Transmission Support Crossmember

Replacement (2WD 2500 HD/3500) or Transmission Support Crossmember
Replacement (2WD 1500/2500) or Transmission Support Crossmember Replacement
(4WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 2500
HD/3500) .

6. Remove the transmission mount. Refer to Transmission Mount Replacement (2WD) or

Transmission Mount Replacement (4WD) .

7. Remove the catalytic converter pipe. Refer to Catalytic Converter Replacement (4.3L)

or Catalytic Converter Replacement (4.8L, 5.3L, 6.0L, 6.2L) or Catalytic Converter

1

Tighten: 10 N.m (89 lb in)

NOTE:

Refer to Fastener Notice .

2

Torque Converter Cover
Tip: Remove the starter. Refer to Starter Motor Replacement (4.3L) or
Starter Motor Replacement (4.8L, 5.3L, 6.0L, and 6.2L) or Starter Motor
Replacement (6.6L) .

3

Torque Converter Cover Bolt

Tighten: 10 N.m (89 lb in)

4

Torque Converter Cover

2008 Chevrolet Silverado 1500

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

Sierra & Silverado