Transfer Case Assemble

Tools Required

• J 3289-20  Holding Fixture
• J 5590  Pinion Bearing Race Installer - Rear
• J 8092  Universal Driver Handle
• J 36370  Drive Sprocket Needle Bearing Installer. See Special Tools .
• J 37668-A  Output Shaft Seal Installer
• J 42738  Seal Installer
• J 43484  Front Output Shaft Seal Installer
• J 45380  Transfer Case Rear Bushing Remover and Installer
• J 45540  Tone Ring and Bearing Installer
• J 45549  Mainshaft Support Bearing Installer. See Special Tools .
• J 45759  Assembly Fixture

IMPORTANT: Always use NEW retaining rings. After installing any of the retaining rings in the following service procedures, ensure the retaining rings are properly seated before proceeding to the next service procedure.
Fig 1: Installing Mounting Stud
Courtesy of GENERAL MOTORS CORP.
1. Install the mounting studs to 29.5-30.5 mm (1.16-1.20 in) in height.
2. Attach the J 45759  to the front transfer case using the adapter studs. All of the assembly procedures can be performed with the case mounted to the J 45759  .
3. Install the J 45759  (2) into the J 3289-20  (1) and secure with the pivot pin.
   Fig 2: View Of Front Transfer Case Bench Mount

   Courtesy of GENERAL MOTORS CORP.
IMPORTANT: When installing the input bearing, ensure the printing on the bearing is facing toward the front of the input gear.
Fig 3: Pressing Input Bearing Into Race
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4. Using a press, install the input bearing. Ensure the bearing is supported by the internal race.
5. Install the input gear bearing retaining ring.
   Fig 4: Placing Retaining Ring On Input Gear

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6. Install the input gear.
   Fig 5: Installing Input Gear

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7. Install the input gear retaining ring.
   Fig 6: Installing Input Gear Retaining Ring

   Courtesy of GENERAL MOTORS CORP.
8. Install the front output shaft bearing in the front case.
   Fig 7: Installing Front Output Shaft Bearing

   Courtesy of GENERAL MOTORS CORP.
   • The bearing will slide in if it is installed straight.
   • The cage side of the bearing faces the inside of the case.
9. Install a new retaining ring for the front input shaft bearing.
   Fig 8: Installing Front Output Shaft Bearing Retaining Ring

   Courtesy of GENERAL MOTORS CORP.
10. Install the front output shaft.
    Fig 9: Installing Front Output Shaft

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11. Install the front output shaft retaining ring.
    Fig 10: Installing Front Output Shaft Retaining Ring

    Courtesy of GENERAL MOTORS CORP.
12. Install the viscous coupling.
    Fig 11: Installing Viscous Coupling

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13. Install the mainshaft assembly.
    Fig 12: Installing Mainshaft Assembly

    Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The blue colored link faces up or toward the rear of the case.
Fig 13: Installing Drive Chain & Sprockets
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14. Install the drive chain and sprockets.
15. Install the driven sprocket retaining ring.
    Fig 14: Locating Driven Sprocket Retaining Ring

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16. Install the carrier retaining ring.
    Fig 15: Installing Carrier Retaining Ring

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17. Lubricate the planetary carrier sun gear bearing with transfer case fluid.
18. Install the sun gear bearing.
    Fig 16: Installing Sun Gear Bearing

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IMPORTANT: Ensure the spline engages with both the sprocket and viscous coupling cover. The sun gear shoulder will bottom on the sprocket if it is installed correctly.
Fig 17: Installing Sun Gear
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19. Install the sun gear.
20. Install the sun gear thrust washer.
    Fig 18: Installing Sun Gear Thrust Washer

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IMPORTANT: When installing the carrier assembly, a snap should be felt and heard when the carrier is properly seated.
Fig 19: Installing Carrier Assembly
Courtesy of GENERAL MOTORS CORP.
21. Install the carrier assembly.
22. Using the J 8092  (1) and the J 45549  (2), install the mainshaft rear bushing in the rear output shaft. See Special Tools .
    Fig 20: Placing Mainshaft Rear Bushing In The Rear Output Shaft

    Courtesy of GENERAL MOTORS CORP.
23. Install the rear output shaft in the annulus gear.
    Fig 21: Installing Rear Output Shaft In The Annulus Gear

    Courtesy of GENERAL MOTORS CORP.
CAUTION: The vehicle could roll while in park if the annulus gear becomes disengaged from the rear output shaft. Always install a new rear output shaft to annulus gear retaining ring. Ensure the rear output shaft retaining ring is fully seated in the annulus gear.
NOTE: Damage may occur to the viscous coupling if the retaining ring for the rear output shaft to the annulus gear fails or becomes dislodged during vehicle operation. Always install a new rear output shaft to annulus gear retaining ring. Ensure the rear output shaft retaining ring is fully seated in the annulus gear.
Fig 22: Installing Annulus Gear Retaining Ring
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24. Install the annulus gear retaining ring.
25. Install the oil pump assembly.
    Fig 23: Installing Oil Pump Assembly

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26. Install the speed reluctor wheel retaining ring.
    Fig 24: Installing Speed Reluctor Wheel Retaining Ring

    Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
• Always use a NEW speed reluctor wheel.
• The speed reluctor wheel should just contact the retaining ring.
Fig 25: Pressing On Speed Reluctor Wheel With J 45540
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27. Using a press, the J 45540  (2) and the J 5590  (1), install the speed reluctor wheel until it is just contacting the retaining ring.
IMPORTANT: Ensure the retaining ring groove on the rear output shaft bearing is facing toward the rear of the rear output shaft.
Fig 26: Installing Rear Output Shaft Bearing
Courtesy of GENERAL MOTORS CORP.
28. Using a press, the J 45540  (2) and the J 5590  (1), install the rear output shaft bearing.
29. Install the rear output shaft bearing retaining ring.
    Fig 27: Installing Rear Output Shaft Bearing Retaining Ring

    Courtesy of GENERAL MOTORS CORP.
30. Install the rear output shaft assembly.
    Fig 28: Installing Rear Output Shaft Assembly

    Courtesy of GENERAL MOTORS CORP.
31. Using the J 8092  (1) and the J 36370  (2), install the front output shaft rear bearing. See Special Tools .
    Fig 29: Installing Front Output Shaft Rear Bearing

    Courtesy of GENERAL MOTORS CORP.
32. Install the wear clip in the rear case half if it was removed.
    Fig 30: Installing Wear Clip

    Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the O-ring is in place in the oil pump.
33. Install the oil pump tube O-ring in the oil pump.
34. Install the oil pump screen and the oil pump tube.
    Fig 31: Installing Oil Pump Screen

    Courtesy of GENERAL MOTORS CORP.
35. Install the chip collector magnet.
NOTE: Apply the proper amount of sealant to the flange when assembling the transfer case. Excessive amounts of sealant can plug the oil pump screen, resulting in internal component failure.
IMPORTANT: Ensure both sealing surfaces of the front and rear case halves are free of dirt, oil, and cleaning solvent.
36. Apply a 3 mm (1/8 in) bead of RTV sealant GM P/N 12345739 (Canadian P/N 10953472) or equivalent to the front case half.
37. Install the locating pins in the front case half.
38. Align the rear case on the rear output shaft bearing.
39. Install the rear case half.
40. Open the outer rear output shaft bearing retaining ring.
    Fig 32: Opening Rear Output Shaft Bearing Retaining Ring

    Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the rear output shaft bearing retaining ring is seated in the groove properly by prying up on the shaft on the rear output shaft assembly.
41. Lower the rear case on to the rear output shaft bearing.
42. Remove the snap ring pliers.
IMPORTANT: Ensure the rear case is squarely seated on the alignment dowels when it is installed.
43. Lower the rear case on to the alignment dowels.
NOTE: This component is made of magnesium. Proper assembly is required to prevent damage. Ensure the magnesium transfer case housings are properly insulated from all external steel components, or galvanic corrosion will occur. Use only the transfer case bolts/studs with the cup style aluminum washer. Use only aluminum fill and drain plugs. Use only aluminum brackets under the case bolts. Ensure new seals are installed that have a rubber insulated outside diameter and have no tears or cuts. Extensive damage will occur if there is galvanic corrosion between the magnesium and steel components.
44. Position the brackets to the proper bolt hole.
NOTE: Refer to Fastener Notice .
Fig 33: Installing New Case Half Bolts And Washers
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45. Install NEW case half bolts and washers.

    Tighten:  Tighten the case half bolts to 37 N.m (27 lb ft).

46. Using the J 45380  , install a new rear output shaft bushing.
    Fig 34: Installing Rear Output Shaft Bushing

    Courtesy of GENERAL MOTORS CORP.
    1. Install the bushing on the finger section of the J 45380  .
    2. Install the finger section to the main body of the J 45380  .
    3. Position the bushing and tool to the case.
    4. Using a hammer and the J 45380  , install the bushing.
47. Using the J 42738  , install the input seal.
    Fig 35: Installing Transfer Case Input Shaft Seal

    Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the drain hole on the boot of the rear output shaft seal is facing down toward the ground.
Fig 36: Installing Output Shaft Seal
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48. Using the J 37668-A  , install the rear output shaft seal.
49. Using the J 43484  (2) and the J 8092  (1), install the front output shaft seal.
    Fig 37: Installing Front Output Shaft Seal

    Courtesy of GENERAL MOTORS CORP.
50. Install the transfer case speed sensor.
    Fig 38: Installing Transfer Case Speed Sensor

    Courtesy of GENERAL MOTORS CORP.

    Tighten:  Tighten the transfer case speed sensor to 15 N.m (11 lb ft).

IMPORTANT: Use only drain and fill plugs made of aluminum. Steel or brass plugs are not compatible with the magnesium case.
Fig 39: Locating Fill & Drain Plugs
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51. Install the drain plug (2).

    Tighten:  Tighten the drain plug to 20 N.m (15 lb ft).

52. Install the fill plug (1).

    Tighten:  Tighten the fill plug to 20 N.m (15 lb ft).

53. Install the access plug.
    Fig 40: Installing Transfer Case Access Plug

    Courtesy of GENERAL MOTORS CORP.