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Fig. 2: Internal Components 11 Rear Case Half 12 Front Output Shaft Seal 13 Vent 14 Input Shaft Seal Callout Component Name 1 Input Gear Bearing 2 Input Shaft 3 Drive Sprocket Bushing 4 Drive Sprocket 5 Drive Chain 6 Front Sun Gear 7 Planetary Differential Assembly 8 Rear Sun Gear Thrust Washer 9 Rear Sun Gear 10 Input Shaft Rear Support Bushing 11 Rear Output Shaft 12 Rear Output Shaft Bearing Outer Retaining Ring 13 Rear Output Shaft Bearing 14 Rear Output Shaft Bearing Retaining Ring
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DIAGNOSTIC INFORMATION AND PROCEDURES DIAGNOSTIC STARTING POINT - TRANSFER CASE Begin the system diagnosis by reviewing the Symptoms - Transfer Case. The Symptoms - The required visual/physical inspections The list of symptoms Use the Strategy Based Diagnosis in order to identify the correct procedure for diagnosing the SYMPTOMS - TRANSFER CASE Strategy Based Diagnostics Review the system operation in order to familiarize yourself with the system functions. Refer to Visual/Physical Inspection Inspect the easily accessible or visible system components for obvious damage, or for Inspect the transfer case for the proper fluid. Refer to Transfer Case Fluid Replacement. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the Transfer Case Popping Noise Transfer Case Whine or Rumble Noise Transfer Case Growl or Grinding Noise 15 Front Output Shaft Rear Bearing 16 Driven Sprocket 17 Front Output Shaft Cup Plug 18 Front Output Shaft 19 Front Output Shaft Front Bearing
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Transfer Case Shudder or Binding Transfer Case Clunk during Acceleration and Deceleration Transfer Case Leak Diagnosis TRANSFER CASE POPPING NOISE TRANSFER CASE WHINE OR RUMBLE NOISE TRANSFER CASE GROWL OR GRINDING NOISE Cause Correction DEFINITION: A faulty internal transfer case component that causes a popping noise in the Replace the chain and sprockets. Refer to Transfer Case Replace the shaft bearings. Refer to Transfer Case Inspect for damaged components caused by metal debris. Cause Correction DEFINITION: A faulty internal transfer case component that causes a whine noise in the 1. Inspect all of the bearings and journals. Refer to Transfer Case Cleaning and Inspection. 2. Replace any faulty bearings, and any components with faulty bearing journals. Refer to Transfer Case Cause Correction DEFINITION: A faulty internal transfer case component that causes a growl or grinding 1. Inspect the planetary differential pinion gears for the
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
TRANSFER CASE SHUDDER OR BINDING following conditions: Chipped, bent or deformed teeth Pinion gear bushings worn Pinion gear thrust washers missing Seized or binding pinion gears Refer to Transfer Case Cleaning and 2. Inspect the planetary differential for deformation. Refer to Transfer Case Cleaning and Inspection. 3. Replace the planetary differential assembly if faulty. Refer to Transfer Case Disassemble and Transfer Sun gears 1. Inspect the sun gears for the following conditions: Gear tooth failure Worn or galled thrust surfaces Refer to Transfer Case Cleaning and 2. Replace the sun gears if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble. Thrust washer 1. Inspect the thrust washer for seizure to the planetary differential. 2. Inspect the thrust washer for galling. 3. Replace the thrust washer if faulty and the mating component if damaged. Refer to Transfer Case Planetary differential not 1. Inspect the planetary differential for being timed properly. Refer to Transfer Case Assemble. 2. Properly time the planetary differential gears. Refer to Transfer Case Assemble.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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