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Transfer Case - Bw 4479 Cadillac STS I рестайлинг

Transfer Case 13 illustrations ~3504 words

Approximate Fluid Capacities

ApplicationSpecification
MetricEnglish
Manual Transmission Fluid GM P/N 88861800 (Canadian P/N 88861801)850 ml0.90 qt

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Case Bolts22-27 N.m16-20 lb ft
Chain Snubber Bolts7 N.m62 lb in
Dampener Attaching Bolts27-35 N.m20-26 lb ft
Drain Plug19-30 N.m14-22 lb ft
Fill Plug19-30 N.m14-22 lb ft
Propeller Shaft-to-Transfer Case Flange Bolt30 N.m22 lb ft
Transfer Case-to-Transmission Bolts60 N.m44 lb ft
Transmission Mount-to-Body Bolt60 N.m44 lb ft
Transmission Mount-to-Transmission Bolt110 N.m81 lb ft
Vent Baffle7 N.m62 lb in

Adhesives, Fluids, Lubricants, and Sealers

ApplicationType of MaterialGM Part Number
United StatesCanada
Chain Snubber BoltsThread Sealant1234538210953489
Drain PlugPipe Sealant1234600410953480
Fill PlugPipe Sealant1234600410953480
Front Output Shaft Cup PlugThread Sealant1234538210953489
Input Shaft Inside Diameter (ID)Lubricant1051344993037
Rear Case Half-to-Front Case HalfRTV Sealant1234573910953541
Thrust WasherTransjel LubricantJ 36850J 36850
Transfer Case FluidManual Transmission Fluid8886180088861801
Vent Baffle BoltsThread Sealant1234538210953489

Scheme 1

Scheme 1: Transfer Case Disassembled View
Scheme 1: Transfer Case Disassembled View
CalloutComponent Name
1Case
2Cover
3Chain Snubber
4Chain Snubber Bolt
5Locating Pin
5Locating Pin
6Fill Plug
7Rear Output Seal
8Drain Plug
9Vent Baffle Bolt
10Vent Baffle
11Case Bolt
12Locating Pin
12Locating Pin
13Input Shaft Seal
14Front Output Seal
15Vent
16Bolts
300Vibration Dampener - V6 Only

Scheme 2

Scheme 2
Scheme 2
CalloutComponent Name
100Thrust Washer
101Rear Sun Gear
102Rear Output Shaft Snap Ring
103Rear Output Shaft Bearing
104Rear Output Shaft Bearing
105Rear Output Shaft Bushing
106Rear Output Shaft
107Upper Sprocket
108Upper Sprocket Bushing
109Chain
110Front Sun Gear
111Carrier
112Front Output Shaft
113Front Output Shaft Bearing
114Front Output Shaft Snap Ring
115Lower Sprocket
116Front Output Shaft Bearing
117Input Shaft Bearing
118Input Shaft

Diagnostic Starting Point - Transfer Case

Begin the system diagnosis by reviewing Symptoms - Transfer Case . Symptoms - Transfer Case provides the following information

  1. The required visual/physical inspections
  2. The list of symptoms

Use Strategy Based Diagnosis in order to identify the correct procedure for diagnosing the system.

Strategy Based Diagnostics

Review the system operation in order to familiarize yourself with the system functions. Refer to Transfer Case Description and Operation .

Visual/Physical Inspection

  1. Inspect the easily accessible or visible system components for obvious damage, or for conditions which could cause the symptom.
  2. Inspect the transfer case for the proper fluid. Refer to «Transfer Case Fluid Replacement»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Transfer Case Popping Noise»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-popping-noise)
  2. «Transfer Case Whine or Rumble Noise»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-whine-or-rumble-noise)
  3. «Transfer Case Growl or Grinding Noise»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-growl-or-grinding-noise)
  4. «Transfer Case Shudder or Binding»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-shudder-or-binding)
  5. «Transfer Case Clunk During Acceleration and Deceleration»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-clunk-during-acceleration-and)
  6. «Transfer Case Leak Diagnosis»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__transfer-case-leak-diagnosis)

Transfer Case Popping Noise

CauseCorrection
DEFINITION: A faulty internal transfer case component that causes a popping noise in the transfer case. Review the Symptoms - Transfer Case and perform the necessary inspections.
Chain jumpReplace the chain and sprockets. Refer to Transfer Case Disassemble and Transfer Case Assemble . Replace the shaft bearings. Refer to Transfer Case Disassemble and Transfer Case Assemble . Inspect for damaged components caused by metal debris. Refer to Transfer Case Disassemble and Transfer Case Assemble .

Transfer Case Whine or Rumble Noise

CauseCorrection
DEFINITION: A faulty internal transfer case component that causes a whine noise in the transfer case. Review the Symptoms - Transfer Case and perform the necessary inspections.
Faulty bearingsInspect all of the bearings and journals. Refer to Transfer Case Cleaning and Inspection . Replace any faulty bearings, and any components with faulty bearing journals. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Worn or loose chainInspect for a loose chain, excessive wear on the snubber or deep gouges in the lining. Replace the chain, sprockets and snubber. Refer to Transfer Case Disassemble and Transfer Case Assemble .

Transfer Case Growl or Grinding Noise

CauseCorrection
DEFINITION: A faulty internal transfer case component that causes a growl or grinding noise in the transfer case while the vehicle is turning. Review the Symptoms - Transfer Case and perform the necessary inspections.
Planetary differentialInspect the planetary differential pinion gears for the 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 Inspection . Inspect the planetary differential for deformation. Refer to Transfer Case Cleaning and Inspection . Replace the planetary differential assembly if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Sun gearsInspect the sun gears for the following conditions: Gear tooth failure Worn or galled thrust surfaces Refer to Transfer Case Cleaning and Inspection . Replace the sun gears if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Thrust washerInspect the thrust washer for seizure to the planetary differential. Inspect the thrust washer for galling. Replace the thrust washer if faulty and the mating component if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Planetary differential not timed properlyInspect the planetary differential for being timed properly. Refer to Transfer Case Assemble . Properly time the planetary differential gears. Refer to Transfer Case Assemble .

Transfer Case Shudder or Binding

CauseCorrection
DEFINITION: A shudder, binding, or a crow-hop while turning, which may cause tire scuffing. Review the Symptoms - Transfer Case and perform the necessary inspections.
Planetary differentialInspect the planetary differential pinion gears for the 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 Inspection . Inspect the planetary differential for deformation. Refer to Transfer Case Cleaning and Inspection . Replace the planetary differential assembly if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Thrust washerInspect the thrust washer for seizure to the planetary differential. Replace the thrust washer if faulty and the mating component if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Planetary differential not timed properlyInspect the planetary differential for being timed properly. Refer to Transfer Case Assemble . Properly time the planetary differential gears. Refer to Transfer Case Assemble .

Transfer Case Clunk During Acceleration and Deceleration

CauseCorrection
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 fluidInspect the transfer case for the correct fluid level. Refer to Transfer Case Fluid Replacement . Inspect the transfer case for the correct type of fluid. Flush the transfer case, and fill with the correct fluid, if required. Refer to Approximate Fluid Capacities .
Worn or faulty planetary differentialInspect the planetary differential for the following conditions: Loose planetary differential splines to the input shaft splines Loose or faulty pinion gears Refer to Transfer Case Cleaning and Inspection . Replace the planetary differential assembly if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Worn or missing sun gear thrust washerInspect to ensure the thrust washer is installed. Inspect the thrust washer and mating surface for excessive wear. Replace the worn or missing thrust washer. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Worn or damaged rear sun gearInspect the sun gear external gear teeth for excessive wear. Inspect the sun gear-to-rear output shaft for excessive looseness. Replace the sun gear or rear output shaft if worn. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Rear output shaft bearing outer retaining ringInspect for the following conditions: Proper installation of the rear output shaft bearing retaining ring Excessive wear or damaged retaining ring groove in the rear case half Repair or replace the following components if found faulty: Properly install a new rear output shaft 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 or loose chainInspect for a loose chain, excessive wear on the snubber or deep gouges in the lining. Replace the chain, sprockets and snubber. Refer to Transfer Case Disassemble and Transfer Case Assemble .

Transfer Case Leak Diagnosis

CauseCorrection
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 leakInspect for the correct sealer and the correct amount of sealer on the plugs. Install the plugs correctly. Refer to Transfer Case Fluid Replacement .
Rear output shaft seal leakingInspect for the following conditions: Overfilled or improper transfer case fluid Blocked vent Seal improperly installed, worn, or damaged Seal bore damaged or cracked Repair or replace the following components if found faulty: Adjust or replace the transfer case fluid. Refer to Transfer Case Fluid Replacement . Replace the rear case half if the seal bore is damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble . Replace the rear output shaft seal. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Front output shaft seal leakingInspect for the following conditions: Overfilled or improper transfer case fluid Blocked vent Seal improperly installed, worn, or damaged Seal bore damaged or cracked Repair or replace the following components if found faulty: Adjust or replace the transfer case fluid. Refer to Transfer Case Fluid Replacement . Replace the front case half if the seal bore is damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble . Replace the front output shaft seal. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Leaking at the ventLeaking vent or input seal will be noticed from a weep hole between the adapter and the transfer case. Transfer case overfilled Inspect for the correct transfer case fluid level. Refer to Transfer Case Fluid Replacement . Damaged O-ring on the vent Transmission output shaft seal leak will be noticed from a weep hole between the adapter and the transfer case.
Transfer case-to-adapter leakInspect for the following conditions: Loose mounting fasteners Gasket or sealant faulty The transfer case input shaft seal leaking Damaged O-ring on vent Repair or replace the following components if found faulty: 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 Repair or replace the loose fasteners. Replace the transfer case gasket or sealer. Repair or replace the following components if found faulty: Leaking transmission output seal Remove transfer case. Refer to Transfer Case Assembly Replacement . Leaking adapter gasket and seal Replace adapter gasket and seal. Refer to Case Extension and Gasket Replacement (6L50) Case Extension and Gasket Replacement (6L80) .
Front case half-to-rear case half seam leakDisassemble and seal the case halves. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Case leakingInspect for a cracked case or case porosity. Replace the faulty case half. Refer to Transfer Case Disassemble and Transfer Case Assemble .

Removal Procedure

Note. When performing the following procedure, use only hand tools to remove and install the drain and fill plugs.

  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2007-2011/remont/hoistjack/#general-information) .
  2. Remove the fill plug (6).
  3. Remove the drain plug (8).
  4. Allow the transfer case to drain completely.

Installation Procedure

  1. Apply sealant GM P/N 12378470, (Canadian P/N 10952622), or equivalent to the threads of the drain plug.
  2. Install the drain plug (8) and tighten to 25 N.m (18 lb ft).
  3. Fill the transfer case to the bottom of the fill plug hole with DEXRON®-III, GM P/N 12346143, (Canadian P/N 10952622).
  4. Install the fill plug (6) and tighten to 25 N.m (18 lb ft).
  5. Lower the vehicle.
  1. Drain the transfer case fluid, if necessary. Refer to «Transfer Case Fluid Replacement»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  2. Remove the exhaust system. Refer to «Exhaust System Replacement»(/cadillac/sts/i-2007-2011/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement) .
  3. Remove the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (AWD)»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RWD)»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) .
  4. Support the transmission with a suitable screw jack and a block of wood.
  5. Remove the transmission mount-to-body bolts.
  6. Using the jack, lower the transmission enough to access the transmission mount-to-transfer case mounting bolts.
  7. Remove the transmission mount-to-transmission case mounting bolts.
  8. Remove the transmission mount assembly from the vehicle.
  9. Remove the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) .
  10. Using another suitable adjustable jack, support the transfer case.
  11. Remove the transfer case bolts.
  12. Remove the transfer case.
  1. Apply grease GM P/N 1051344 (Canadian P/N 993037), or equivalent, on the input splines starting from the front edge to 10 mm inward in a continuous pattern around the inside diameter (ID) of the splines to completely fill the splines.
  2. Install the transfer case. CAUTION: Refer to «Fastener Caution»(/cadillac/sts/i-2007-2011/remont/oem-general-information/#dangers-warnings-and-cautions__fastener-caution) .
  3. Install the transfer case-to-transmission bolts and tighten to 60 N.m (44 lb ft).
  4. Remove the adjustable jack from the transfer case.
  5. Install the transmission mount assembly. Refer to «Transmission Mount Replacement (All Wheel Drive)»(/cadillac/sts/i-2007-2011/remont/automatic-trans/#how-to-overhaul-the-automatic-transmission-6l506l80-removal-installation-service-troubleshooting-diagnosis) or «Transmission Mount Replacement (Rear Wheel Drive)»(/cadillac/sts/i-2007-2011/remont/automatic-trans/#how-to-overhaul-the-automatic-transmission-6l506l80-removal-installation-service-troubleshooting-diagnosis) .
  6. Remove the jack and block of wood from under the transmission.
  7. Install the front propeller shaft. Refer to «Front Propeller Shaft Replacement»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) .
  8. Install the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (AWD)»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RWD)»(/cadillac/sts/i-2007-2011/remont/driveshaft-universal-joints/#propeller-shaft) .
  9. Install the exhaust system. Refer to «Exhaust System Replacement»(/cadillac/sts/i-2007-2011/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement) .
  10. Refill the transfer case with fluid. Refer to «Transfer Case Fluid Replacement»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Tools Required

  1. J-2619-A Slide Hammer w/Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  2. J 8092 Driver Handle
  3. J 45278 Seal Remover. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  4. J 46269 Input Seal Installer. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Replacement Procedure

  1. Remove the transfer case. Refer to «Transfer Case Assembly Replacement»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  2. Using the J 45278 (2) and the J-2619-A (1), slide the hook end of the J 45278 beside the seal lip and shaft. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) . Turn the hook approximately 60 degrees and pull the seal out with the J-2619-A (1). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  3. Clean the seal area (1) and input shaft of any old seal material with solvent.
  4. Use the J 8092 (1) and the J 46269 (2) to drive in a NEW input seal. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  5. Install the transfer case. Refer to «Transfer Case Assembly Replacement»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Special Tools

  1. DT-47752 Split Plate Set. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  2. J-2619-A Slide Hammer w/Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  3. J 8107-2 Side Bearing Puller Pilot. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  4. J 8433 Two Jaw Puller. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  5. J 22888-20A Universal Two Jaw Puller. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  6. J 23444-A Extreme Press Lubricant - 1/4-Ounce Tube. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  7. J 29369-1 Bushing and Bearing Remover. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Removal/Installation Procedure

  1. Remove the bolts (16) and the dampener (300), some models.
  2. Remove the drain plug (8) and the fill plug (6). Ensure all transfer case fluid is drained out of the transfer case.
  3. Remove the 17 case attaching bolts (11).
  4. Using a screwdriver at the pry points located on the case (1) and cover (2), pry the case (1) and cover (2) apart.
  5. Separate the case (1) and cover (2).
  6. Remove the alignment dowel (3) from the case, if necessary.
  7. Remove the chain snubber.
  8. Install 1 plate of the DT-47752 perpendicular to the chain and rotate 180 degrees. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  9. Install the second plate perpendicular to the chain and secure with the short plate bolts.
  10. Install the DT-47752-2 (2) onto the front output shaft (112).
  11. Using the long bolts and washers from the DT-47752 , install the J 8433 (1). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) . Tighten evenly so the puller remains parallel to the plates.
  12. Install the DT-47752-3 into the input shaft.
  13. Using an impact wrench, tighten the forcing screw of the DT-47752-2 in order to remove the sprockets, chain, and carrier assembly.
  14. Remove the J 8433 (1) and the DT-47752-2 (2). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  15. Remove the lower sprocket (112), chain (109), and carrier (111) as an assembly.
  16. Remove the DT-47752 from the case. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  17. Remove the snap ring (114).
  18. Push the front output shaft (112) from the case (1).
  19. Remove the vent baffle bolt (9) and baffle (10) from the case (1).
  20. Using a hammer and a suitable driver, remove the front output seal (13) and input seal (14) from the case (1).
  21. Using a hammer and a suitable punch, remove the front output bearing (113) and input bearing (117) if they are to be replaced.
  22. If required, remove the vent (15) and discard.
  23. Install a NEW vent.
  24. Remove the thrust washer (100) from the carrier (111).
  25. Using a press, remove the input shaft assembly (118, 107, and 110) from the carrier (111).
  26. Note the direction of the carrier assembly (111). The groove around the splines face toward the output shaft.
  27. Using the J 22888-20A (1) and the J 8107-2 (2), remove the rear sun gear (101) from the rear output shaft. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  28. Using snap ring pliers, remove the snap ring (102) from the output shaft (106).
  29. Push the output shaft (106) from the cover (2).
  30. Using a hammer and a suitable punch, from inside the cover, drive out the rear output seal (7) and the outside output bearing (104).
  31. Using a hammer and a suitable punch, from outside the cover (2), inside the output shaft bore, drive out the inner output shaft bearing (103).
  32. Using the J-2619-A (1) and the J 29369-1 (2), remove the front output cover bearing (116) from the cover. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  1. J-2619-A Slide Hammer w/Adapter. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  2. J 3289-20 Holding Fixture
  3. J 45548 Mainshaft Support Bushing/Bearing Remover. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  4. J 46266 Bushing Installer. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  1. Clean the front case half in cleaning solvent and air dry.
  2. Remove the sealer from the case sealing surfaces (2).
  3. Inspect the case for being broken or cracked.
  4. Inspect the front output shaft front bearing bore (4) for the following conditions: A spun bearing Cracks
  5. Inspect the input shaft bearing bore (3) for the following conditions: A spun bearing Cracks
  6. Replace the front case half if any of the above conditions are found.
  7. Inspect the sealing surfaces (2) for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the front case to transmission case mounting surface for damage.
  10. Inspect the front output shaft front bearing and the input shaft bearing for the following conditions: Roughness Brinelling Pitting
  11. Replace the bearings if any of the above conditions are found. Refer to «Transfer Case Disassemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) and «Transfer Case Assemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Cover

  1. Clean the cover in cleaning solvent and air dry.
  2. Remove the sealer from the case sealing surfaces.
  3. Inspect the case for being broken or cracked.
  4. Replace the case if it is broken or cracked.
  5. Inspect the sealing surfaces (1) for damage.
  6. Repair small scratches or nicks with a soft stone.
  7. Inspect the case threaded bolt holes (2) for damage.
  8. Repair any damaged threads.
  9. Inspect the front output shaft rear bearing bore (3) for the following conditions: Spun bearing Cracks
  10. Inspect the rear output shaft rear bearing bore (4) for the following conditions: Spun bearing Cracks
  11. Replace the case if the bearing has spun. Refer to «Transfer Case Disassemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) and «Transfer Case Assemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Differential Components

  1. Clean the planetary differential in cleaning solvent. Do not disassemble the planetary differential.
  2. Air dry and ensure all cleaning solvent is removed from the bearings in the pinion gears (3). Do not spin the pinion gears with compressed air.
  3. Inspect the pinion gears for the following conditions: Chipped teeth Debris embedded in the root of the teeth Excessive side movement from worn bushings or shafts
  4. Inspect the planetary housing for cracks at the web (1) of the housing.
  5. Inspect the thrust washer surface (2) for scoring or excessive wear.
  6. Inspect the planetary housing for distortion.
  7. Inspect the planetary housing to mainshaft splines for excessive wear.
  8. Replace the planetary differential if any of the above conditions are found.
  9. Inspect the planetary thrust washers for excessive wear or scoring.
  10. Replace the thrust washers if they are faulty.
  1. Clean the front sun gear (110) and the rear sun gear (101) in cleaning solvent and air dry.
  2. Inspect the teeth on the front sun gear (110) and the rear sun gear (101) for the following conditions: Chipped teeth Excessively worn gear surfaces Slight wear marks are normal. Debris embedded in the root of the teeth
  3. Inspect the thrust washer surfaces for excessive wear or scoring.
  4. Replace the front sun gear (110) and the rear sun gear (101) if they are faulty.

Drive Chain and Sprockets

  1. Clean the drive chain (109), drive sprocket (107), snubber (3), and driven sprocket (115) in cleaning solvent and air dry.
  2. Inspect the drive chain (109) for the following conditions: Loose link pins Binding or stiff links Debris embedded in the links Worn teeth surfaces
  3. Replace the chain if any of the above conditions are found.
  4. Inspect the driven sprocket (115) and the drive sprocket (107) for the following conditions: Chipped teeth Excessively worn gear surfaces Slight wear marks are normal. Debris embedded in the root of the teeth
  5. Inspect the drive sprocket (107) and bushing (105) for the following conditions: Excessive wear Scoring
  6. Replace the sprockets if any of the above conditions are found. The chain and sprockets may be replaced separately.
  7. Inspect the snubber (3) for an excessively worn or gouged lining. Slight wear marks are normal.
  8. Inspect the chain and sprockets for the cause of the wear. Replace as required.
  9. If the bushing in the sprocket (107) is damaged, it can be replaced using the J 46266 and a press to remove the bushing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  10. Clean the bushing bore with solvent.
  11. Inspect the bushing bore for nicks or burrs.
  12. Place the NEW bushing (108) in the sprocket bore.
  13. Use the other side of the J 46266 and press in the NEW bushing until the tool meets the sprocket. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Input Shaft

  1. Clean the input shaft in cleaning solvent.
  2. Inspect the input seal surface (1) for excessive grooves or damage.
  3. Inspect the bearing journals on the input shaft for the following conditions: The drive gear bushing (2) The rear support bushing end (4) Scoring Pitting Excessive wear
  4. Inspect the input shaft planetary carrier assembly splines (3) for damage or excessive wear. Witness marks at the location of the gear is normal.
  5. Replace the input shaft if any of the above conditions are found.

Front Output Shaft

  1. Clean the front output shaft (112) in cleaning solvent and air dry.
  2. Inspect for spun bearings at the front output shaft bearing areas.
  3. Inspect the front output internal splines and driven gear splines for damage or excessive wear.
  4. Replace the front output shaft if it is damaged.
  5. Inspect the front output shaft bearings (113 and 116) for the following conditions: Scoring Pitting Brinelling Excessive wear
  6. Replace the front output shaft bearings if they are faulty. Refer to «Transfer Case Disassemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) and «Transfer Case Assemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Rear Output Shaft

  1. Clean the rear output shaft (106) and rear output shaft bearings (104) in cleaning solvent.
  2. Air dry and ensure all solvent is removed from the bearing.
  3. Inspect the rear output shaft bearings (103 and 104) for the following conditions: Scoring Pitting Brinelling Excessive wear
  4. Replace the rear output shaft bearings if they are faulty. Refer to «Transfer Case Disassemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) and «Transfer Case Assemble»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  5. Inspect the mainshaft rear support bushing (105) for the following conditions: Pitted Wear Corrosion
  6. Replace the rear output shaft if any of the above conditions are found.
  7. Inspect the rear output shaft splines for wear or damage.
  8. Inspect the rear output shaft bearing area for a spun bearing.
  9. If the bearing area or splines are damaged, replace the rear output shaft.
  10. If the bushing (105) is damaged, it can be replaced. Place the J 45548 inside the bushing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  11. With the ridge on the J 45548 , behind the bushing, tighten the center bolt of the J 45548 in order to lock it behind the bushing. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  12. With position pins removed from the J 3289-20 , place the output shaft as shown.
  13. Insert the J-2619-A (2) into the J 45548 (1) and pull the bushing from the output shaft. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  14. Clean the bushing bore with solvent. Inspect for nicks and burrs.
  15. Place a NEW bushing (105) in the bore.
  16. Place the J 46266 into the bushing as shown. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  17. Using a press, push the bushing into the bore until the tool meets the output shaft.
  1. J 5590 Pinion Bearing Race Installer - Rear
  2. J 8092 Driver Handle
  3. J 24433 Pinion Cone and Side Bearing Installer. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  4. J 36850 Transjel Lubricant
  5. J 46268 Output Seal Installer. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  6. J 46269 Input Seal Installer. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .

Assembly Procedure

  1. Install the input shaft bearing (117) into the case (1).
  2. Install the front output shaft bearing (113) into the case (1).
  3. Using the J 46269 (2) and the J 8092 (1), install the input shaft oil seal (13).
  4. Using the J 46268 (2) and the J 8092 (1), install the front output shaft oil seal (14). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  5. Install the chain snubber (3).
  6. Apply sealant GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the bolts (4) and tighten to 7 N.m (62 lb in).
  7. Install the vent baffle (10).
  8. Apply sealant GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the bolt (9) and tighten to 7 N.m (62 lb in).
  9. With the thrust washer side of the planetary differential facing down, align the marks on the pinion gears. Position the alignment marks with an area on the planetary differential that can be reference for all gears.
  10. Use a press to install the input shaft assembly to the carrier (111).
  11. Lubricate the thrust washer (100) with J 36850 or equivalent.
  12. Install the thrust washer over the rear of the input shaft, into the groove of the carrier (111).
  13. Insert the sun gear (101) into the carrier.
  14. If the pinion gears are properly aligned, the sun gear (101) carrier assembly will rotate freely.
  15. Remove the sun gear (101) from the carrier (111).
  16. Assemble the front output shaft (112) to the case (1).
  17. Assemble the snap ring (114).
  18. Assemble the chain (109), upper gear of the planetary assembly, and lower sprocket (115) to the case (1).
  19. Use the J 5590 and a press to fully seat the lower sprocket (115) to the front output shaft, while guiding the input shaft of the planetary assembly, until it is seated to the case.
  20. Install the rear output shaft bearing (104).
  21. Using the J 46268 (2) and the J 8092 (1), install the rear output oil seal (7). See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  22. Install the inner output shaft bearing (103).
  23. Install the front output shaft inner bearing (116).
  24. Install the rear output shaft (106) by pushing it in through the bearings.
  25. Install the rear output shaft snap ring (102) in the lower groove of the output shaft (106).
  26. Use the J 24433 and a press to install the sun gear (101) to the output shaft. See «Special Tools»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479) .
  27. Install the dowel pins (5) into the cover (2), if necessary.
  28. Apply a 3.175 mm (1/8 in) bead of RTV sealant GM P/N 12345739 (Canadian P/N 10953541), or equivalent, to the mating surfaces of the cover (2).
  29. Insert the dowel pin (3), if removed.
  30. Lower the cover (2) over the case (1). Turn the rear output shaft in order to align the splines and the shaft into the bearing in the cover.
  31. Install the case bolts (11) and tighten to 25 N.m (18 lb ft).
  32. Install the vent breather by pushing it into the hole. Align the flat on vent with the flat on the case.
  33. Lightly pull on the vent to ensure proper installation.
  34. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the drain plug (8).
  35. Install the drain plug (8) and tighten to 25 N.m (18 lb ft).
  36. Fill the transfer case with manual transmission fluid GM P/N 88861800 (Canadian P/N 88861801). Fill to the bottom of fill plug threads. Ensure the vehicle is on a level surface. Refer to «Approximate Fluid Capacities»(/cadillac/sts/i-2007-2011/remont/transfer-case/#transfer-case-bw-4479__approximate-fluid-capacities) .
  37. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the fill plug.
  38. Install the fill plug (6) and tighten to 25 N.m (18 lb ft).
  39. Install the dampener (300) and the bolts (16) and tighten to 27 N.m (20 lb ft).

Scheme 3

Scheme 3: Transfer Case Description and Operation
Scheme 3: Transfer Case Description and Operation

The Borg Warner (BW) model 4479, transfer case is a 1-speed, full-time, all wheel drive (AWD), transfer case. The transfer case provides power to both axles through an external planetary type differential, which has 2 different sets of pinion gears. The planetary differential provides a 40/60 torque split, front/rear, full-time. This means both axles are constantly being driven for maximum traction in all conditions. The BW 4479 design of the planetary differential allows the use with the vehicle stability enhancement system (VSES) vehicles. The VSES takes use of the planetary differential by applying braking to a tire that has less traction and dividing the engine torque to the other axle.

Reduced driveline backlash is achieved through press fit interfaces of the lower sprocket, sun gear, and input shaft assembly.

The BW 4479 case halves are high-pressure, die-cast aluminum. Ball bearings support the input shaft, the front output shaft, and the rear output shaft. The transfer case requires manual transmission fluid GM P/N 88861800 (Canadian P/N 88861801), which is red in color.

Illustration Tool Number/Description DT-47752 Split Plate Set J-2619-A Slide Hammer w/Adapter J 3289-20 Holding Fixture J 5590 Pinion Bearing Race Installer - Rear J 8092 Driver Handle J 8107-2 Side Bearing Puller Pilot J 8433 Two Jaw Puller J 22888-20A Universal Two Jaw Puller J 23444-A Extreme Press Lubricant - 1/4-Ounce Tube J 24433 Pinion Cone and Side Bearing Installer J 29369-1 Bushing and Bearing Remover J 36850 Transjel Lubricant J 45278 Seal Remover J 45548 Mainshaft Support Bushing/Bearing Remover J 46266 Bushing Installer J 46268 Output Seal Installer J 46269 Input Seal Installer

Scheme 4

Scheme 4: Special Tools
Scheme 4: Special Tools

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13