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Chevrolet Silverado / GMC Sierra. Manual - part 2929
TRANSFER CASE SHUDDER OR BINDING
Excessive clearance
between the slip yoke and
the rear output shaft
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 or Two-
Piece Propeller Shaft Replacement .
Replace the rear output shaft, if required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble .
Excessive clearance
between the slip yoke and
the rear bushing
1. Inspect for the following conditions:
Worn 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 .
Cause
Correction
DEFINITION: When in the AWD mode, a shudder is felt during acceleration or a crow-
hop or binding while turning, which may cause tire scuffing.
Review the Symptoms - Transfer Case and perform the necessary inspections.
Oil breakdown or
contamination
Flush the transfer case and fill with the correct fluid. Refer to
Transfer Case Fluid Replacement.
Incorrect transfer case fluid
Flush the transfer case and fill with the correct fluid. Refer to
Transfer Case Fluid Replacement.
Burrs on the clutch hub slots
1. Inspect the clutch disc tab slots in the clutch hub for
burrs or notches. Refer to Two/Four Wheel Drive
Shift Components Cleaning and Inspection.
2. De-burr the hub slots. If the hub slots are excessively
notched, replace the clutch hub. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
TRANSFER CASE WILL NOT SHIFT
Cause
Correction
DEFINITION: While shifting from HI range to LO range, there is gear clashing or the gear
range cannot be selected.
Review the Symptoms - Transfer Case and perform the necessary inspections.
High/low shift fork spring
assembly
1. Inspect the high/low shift fork spring assembly for the
following conditions:
Worn high/low shift fork pin
Worn cam
Broken spring
Refer to High/Low Shift Components Cleaning
and Inspection .
2. Replace the following components if found faulty:
The high/low shift fork spring assembly
The high/low shift fork pin
Refer to High/Low Shift Fork Replacement .
High/low shift fork
1. Inspect the high/low shift fork for the following
conditions:
Worn shift fork pads
Cracked or bent shift fork
Refer to High/Low Shift Components Cleaning
and Inspection .
2. Replace the following components if found faulty:
The shift fork pads
The shift fork
Refer to High/Low Shift Fork Replacement .
1. Inspect the high/low clutch for the following conditions:
Engagement teeth for burrs or damage
Sliding freely on the rear output shaft
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
TRANSFER CASE JUMPS OUT OF GEAR
High/low clutch
The high/low clutch collar for excessive wear
Refer to High/Low Shift Components Cleaning
and Inspection .
2. Replace the high/low clutch if faulty. Refer to Transfer
Case Disassemble and Transfer Case Assemble.
Input shaft pilot bearing
assembly
1. Inspect for the following conditions:
Failed bearing in the input shaft
Journal on the rear output shaft for excessive wear
or damage
Refer to Rear Output Shaft Cleaning and
Inspection and Front Output Shaft and Input
Shaft Cleaning and Inspection .
2. Replace the bearing if faulty. Refer to Input Shaft Pilot
Bearing Replacement (Light Duty) or Input Shaft
Pilot Bearing Replacement (Heavy Duty and Super
Heavy Duty) .
3. Replace the rear output shaft if damaged. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.
High/low planetary carrier
assembly
1. Inspect the high/low planetary engagement teeth for burrs
or damage. Refer to High/Low Planetary Carrier
Cleaning and Inspection .
2. Replace the high/low planetary carrier assembly if faulty.
Refer to Transfer Case Disassemble and Transfer
Case Assemble.
Cause
Correction
DEFINITION: Loss of the transfer case drive torque during deceleration, acceleration or
under load.
Review the Symptoms - Transfer Case and perform the necessary inspections.
1. Inspect the high/low shift fork pads for wear. Refer to
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
High/low shift fork pads
High/Low Shift Components Cleaning and
Inspection.
2. Replace the fork pads if worn. Refer to Transfer Case
Disassemble and Transfer Case Assemble.
Faulty high/low shift fork
1. Inspect the high/low shift fork for being damaged. Refer
to High/Low Shift Components Cleaning and
Inspection.
2. Replace the high/low shift fork if faulty. Refer to
High/Low Shift Fork Replacement.
High/low shift fork spring
assembly
1. Inspect the high/low shift fork spring assembly for the
following conditions:
Worn high/low shift fork pin
Worn cam
Broken spring
Refer to High/Low Shift Components Cleaning
and Inspection .
2. Replace the following components if found faulty:
The high/low shift fork spring assembly
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.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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