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Chevrolet Silverado / GMC Sierra. Manual - part 2880
noise in the transfer case while the vehicle is turning or in a four wheel drive mode.
Review the Symptoms - Transfer Case and perform the necessary inspections.
High/low planetary carrier
assembly
1. Inspect the high/low planetary carrier assembly for the
following conditions:
Chipped, bent, or deformed teeth
Planetary gear needle bearings worn
Planetary gear thrust washer cracked or missing
Seized or binding planetary gears
Refer to High/Low Planetary Carrier Cleaning
and Inspection .
2. Replace the high/low planetary carrier assembly if any of
the above conditions exist. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
Input shaft
1. Inspect the input shaft in the planetary carrier assembly
for excessive thrust end play.
2. Inspect the input shaft teeth for the following conditions:
Damage
Worn or galled thrust surfaces
Excessive wear
Chipped teeth
Metal embedded in the root of the teeth
Refer to Front Output Shaft and Input Shaft
Cleaning and Inspection .
3. Replace the input shaft if faulty. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
Thrust washers
1. Inspect for missing or damaged input shaft thrust washers.
2. Inspect the thrust washers for galling.
3. Replace the thrust washers if faulty and the mating
component if damaged. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
1. Inspect the high/low internal gear teeth for the following
conditions:
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
TRANSFER CASE CLUNK IN 2HI ONLY
High/low internal gear
Damage
Chipped teeth
Excessive wear
Metal embedded in the root of the teeth
Refer to Transfer Case Front Half Cleaning and
Inspection .
2. Replace the front case half if the high/low internal gear is
faulty. Refer to Transfer Case Disassemble and
Transfer Case Assemble.
Cause
Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer
case.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Incorrect fluid level or
incorrect fluid
1. Inspect the transfer case for the correct fluid level.
2. Inspect the transfer case for the correct type of fluid.
Refer to Approximate Fluid Capacities .
3. Flush the transfer case and fill with the correct fluid, if
required. Refer to Transfer Case Fluid Replacement.
Excessive clearance
between the slip yoke and
the rear output shaft
1. Inspect for the following conditions:
Worn slip yoke splines
Worn rear output shaft splines
2. Repair or replace the following components, if faulty:
Replace the slip yoke, if required. Refer to One-
Piece Propeller Shaft Replacement and Two-
Piece Propeller Shaft Replacement .
Replace the rear output shaft, if required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble .
1. Inspect for the following conditions:
Worn rear bushing
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
TRANSFER CASE CLUNK IN 4HI
Excessive clearance
between the slip yoke and
the rear bushing
Worn slip yoke bushing journal
2. Repair or replace the following components, if faulty:
Replace the slip yoke, if required. Refer to One-
Piece Propeller Shaft Replacement or Two-
Piece Propeller Shaft Replacement .
Replace the rear bushing if worn. Refer to
Transfer Case Rear Extension Bushing
Replacement .
Input shaft thrust washers
1. Inspect for worn or missing input shaft thrust washers.
2. Replace the thrust washers as required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.
Worn high speed teeth on
the high/low clutch
1. Inspect for worn high speed teeth on the high/low clutch.
Refer to High/Low Shift Components Cleaning and
Inspection.
2. Replace the high/low clutch if worn. Refer to Transfer
Case Disassemble and Transfer Case Assemble.
Rear output shaft rear
bearing outer retaining ring
1. Inspect for the following conditions:
Properly installed rear output shaft rear bearing
outer retaining ring
Excessive wear or damaged retaining ring groove in
the rear case half
2. Repair or replace the following components if found
faulty:
Properly install a new rear output shaft rear bearing
outer retaining ring.
Replace the rear case half if the retaining ring
groove is excessively worn. Refer to Transfer
Case Disassemble and Transfer Case Assemble .
Cause
Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer
case while in the 4HI range only.
Review the Symptoms - Transfer Case and perform the necessary inspections.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Incorrect fluid level or
incorrect fluid
1. Inspect the transfer case for the correct fluid level.
2. Inspect the transfer case for the correct type of fluid.
Refer to Approximate Fluid Capacities .
3. Flush the transfer case and fill with the correct fluid, if
required. Refer to Transfer Case Fluid Replacement.
Input shaft thrust washers
1. Inspect for worn or missing input shaft thrust washers.
2. Replace the thrust washers as required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.
2/4 wheel drive
synchronizer assembly
1. Inspect the synchronizer for the following conditions:
The synchronizer hub internal teeth to rear output
shaft splines for excessive looseness caused by wear
The synchronizer sleeve engagement teeth to the
drive sprocket for wear
Refer to Two/Four Wheel Drive Shift
Components Cleaning and Inspection .
2. Replace the synchronizer assembly if faulty. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.
Rear output shaft rear
bearing outer retaining ring
1. Inspect for the following conditions:
Properly installed rear output shaft rear bearing
outer retaining ring
Excessive wear or damaged retaining ring groove in
the rear case half
2. Repair or replace the following components if found
faulty:
Properly install a new rear output shaft rear bearing
outer retaining ring.
Replace the rear case half if the retaining ring
groove is excessively worn. Refer to Transfer
Case Disassemble and Transfer Case Assemble .
Worn high speed teeth on
1. Inspect for worn high speed teeth on the high/low clutch.
Refer to High/Low Shift Components Cleaning and
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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