Chevrolet Silverado / GMC Sierra. Manual — part 2882
The high/low shift fork pin
Refer to High/Low Shift Fork Replacement .
Faulty high speed teeth on
the high/low clutch
1. Inspect for the following conditions:
The input shaft high speed engagement teeth for
wear or damage
The engagement teeth on the high/low clutch for
wear or damage
Refer to Front Output Shaft and Input Shaft
Cleaning and Inspection and High/Low Shift
Components Cleaning and Inspection .
2. Replace the high/low clutch if the teeth are faulty. Refer
to Transfer Case Disassemble and Transfer Case
Assemble.
3. Replace the input shaft if the engagement teeth are faulty.
Refer to Transfer Case Disassemble and Transfer
Case Assemble.
High/low planetary carrier
assembly
1. Inspect the high/low planetary carrier for the following
conditions:
Low speed engagement teeth worn or damaged
Cracked carrier housing
Planetary gear needle bearings worn
Planetary gears broken or damaged teeth
Planetary gears seized or binding
Refer to High/Low Planetary Carrier Cleaning
and Inspection .
2. Replace the high/low planetary carrier if any of the
above conditions exist. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
Front output shaft drive
sprocket
1. Inspect the drive sprocket for worn engagement teeth.
Refer to Drive Chain, Drive Sprocket, and Driven
Sprocket Cleaning and Inspection.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
TRANSFER CASE LEAK DIAGNOSIS
2. Replace the drive sprocket if faulty. Refer to Transfer
Case Disassemble and Transfer Case Assemble.
2/4 wheel drive
synchronizer sleeve
1. Inspect the synchronizer sleeve for worn engagement
teeth. Refer to Two/Four Wheel Drive Shift
Components Cleaning and Inspection.
2. Replace the synchronizer sleeve if faulty. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.
Input shaft pilot bearing
assembly
1. Inspect the bearing in the input shaft and the rear output
shaft journal for excessive wear. Refer to Front Output
Shaft and Input Shaft Cleaning and Inspection and
Rear Output Shaft Cleaning and Inspection
.
2. Replace the bearing and the rear output shaft if faulty.
Refer to Input Shaft Pilot Bearing Replacement
(Heavy Duty and Super Heavy Duty) and Transfer
Case Assemble.
Input shaft
1. Inspect the input shaft for broken or damaged teeth.
Refer to Front Output Shaft and Input Shaft
Cleaning and Inspection.
2. Replace the input shaft if faulty. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
Cause
Correction
DEFINITION: A visible indication of an external fluid leak from the transfer case.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Drain plug or fill plug leak
1. Inspect for the correct sealer and the correct amount of
sealer on the plugs. Refer to Sealers, Adhesives, and
Lubricants.
2. Install the plugs correctly. Refer to Transfer Case Fluid
Replacement.
Access hole plugs leaking
Replace the access hole plugs or seal with room temperature
vulcanizing (RTV) sealer.
1. Remove the VSS. Refer to Vehicle Speed Sensor
Replacement.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Vehicle speed sensor (VSS)
leaking
2. Inspect the VSS for the following conditions:
Cross threaded
Cut or damaged VSS O-ring seal
VSS over tightened causing deformation in the VSS
3. Replace the VSS O-ring seal if faulty.
4. Replace the VSS if faulty.
Rear output shaft seal
leaking
1. Inspect for the following conditions:
Overfilled or improper transfer case fluid
Blocked vent
Seal improperly installed, worn or damaged
Seal bore damaged or cracked
Rear output shaft bushing for excessive wear
Slip yoke seal surface for wear or pitting
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 rear output shaft seal. Refer to Rear
Output Shaft Seal Replacement .
Replace the rear case half if the seal bore is
damaged. Refer to Transfer Case Disassemble
and Transfer Case Assemble .
Replace the rear bushing if worn. Refer to
Transfer Case Rear Extension Bushing
Replacement .
Replace the slip yoke if the surface could cause
leakage. Refer to One-Piece Propeller Shaft
Replacement or Two-Piece Propeller Shaft
Replacement .
1. Inspect for the following conditions:
Overfilled or improper transfer case fluid
Blocked vent
Seal improperly installed, worn or damaged
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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
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