Chevrolet Silverado / GMC Sierra. Service manual — part 2883

Front output shaft seal
leaking

Seal bore damaged or cracked

Leaking cup plug in the front output shaft

2. Repair or replace the following components if found

faulty:

Adjust or replace the transfer case fluid. Refer to
Transfer Case Fluid Replacement .

Clean or properly route the vent hose.

Replace the front output shaft seal. Refer to Front
Output Shaft Seal Replacement .

Replace the front case half if the seal bore is
damaged. Refer to Transfer Case Disassemble
and Transfer Case Assemble .

Replace the cup plug in the front output shaft if it is
leaking. Refer to Transfer Case Disassemble and
Transfer Case Assemble .

2/4 wheel drive actuator
seal leaking

Replace the actuator seal. Refer to Transfer Case Two/Four
Wheel Drive Actuator Replacement.

Leaking at the vent pipe

Transfer case overfilled

Inspect for the correct transfer case fluid level. Refer to
Transfer Case Fluid Replacement.

Inspect for a damaged or missing vent pipe.

Replace a damaged or missing vent and seal the vent pipe
with the correct sealer. Refer to Transfer Case
Assemble.

1. Inspect for the following conditions:

Loose mounting fasteners

Gasket faulty

The transfer case input shaft seal leaking

The pilot bearing in the input shaft leaking

2. Repair or replace the following components if found

faulty:

Repair or replace the loose fasteners. Refer to
Transfer Case Adapter Replacement .

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

REPAIR INSTRUCTIONS - ON VEHICLE

TRANSFER CASE SHIFT CONTROL SWITCH REPLACEMENT (WITHOUT SLT)

Transfer case to adapter
leak

Replace the transfer case adapter gasket. Refer to
Transfer Case Adapter Replacement .

Replace the transfer case input shaft seal. Refer to
Input Shaft Seal Replacement .

Inspect for the following conditions:

Seal improperly installed, worn, or damaged

Seal bore damaged or cracked

Input shaft seal surface worn, grooved, or
damaged

Replace the pilot bearing in the input shaft if it is
leaking. Refer to Transfer Case Disassemble and
Transfer Case Assemble .

Case leaking

1. Inspect for the following conditions:

A cracked case

Case porosity

2. Replace the faulty case half. Refer to Transfer Case

Disassemble and Transfer Case Assemble.

Front case half to rear case
half seam leak

Disassemble and seal the case halves. Refer to Transfer Case
Disassemble and Transfer Case Assemble.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 6: Transfer Case Shift Control Switch Replacement (Without SLT)
Courtesy of GENERAL MOTORS CORP.

TRANSFER CASE SHIFT CONTROL SWITCH REPLACEMENT (WITH SLT)

Callout

Component Name

1

Instrument Panel Accessory Trim Plate
Refer to Instrument Panel Accessory Trim Plate Replacement (without
RPO SLT) .

2

Transfer Case Shift Control Switch
Procedure:
Disconnect the electrical connector.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 7: Transfer Case Shift Control Switch Replacement (With SLT)
Courtesy of GENERAL MOTORS CORP.

TRANSFER CASE SHIFT CONTROL MODULE REPLACEMENT

Callout

Component Name

Preliminary Procedure:
Remove the headlight bezel. Refer to Headlamp Switch Bezel Replacement (with RPO
SLT) .

1

Transfer Case Control Switch
Tip:

Disconnect the electrical connectors from the headlight and control
switches.

It may be necessary to use a small flat bladed screw driver to depress the
locking tabs to remove the control switch.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado