GM Service Manual Online
For 1990-2009 cars only

Disassembly Procedure

Tools Required

    • J 8092 Universal Driver Handle
    • J 36370 Drive Sprocket Needle Bearing Installer
    • J 29170 Drive Sprocket Bearing Remover
    • J 29369 Output Shaft Bearing Remover
    • J 9276-21 Adapter
    • J 2619-01 Slide Hammer
    • J 33790 Input Sungear Needle Bearing Installer

    Important: 

       • The annulus gear found in this transfer case is not serviceable or removed. The gear should only be replaced as a unit with the front case half. Damage will occur to the case if the gear is removed.
       • The oil pump is not a serviceable unit and should be replaced if it is defective.

  1. Use solvent and a stiff brush to clean the exterior of the transfer case.

  2. Object Number: 2219  Size: SH
  3. Remove the shift motor bolts.

  4. Object Number: 2220  Size: SH
  5. Remove the shift motor.

  6. Object Number: 2242  Size: SH
  7. Remove the vehicle speed sensor.
  8. Remove the speed sensor O-ring from the sensor.
  9. Remove the vacuum switch and its O-ring.

  10. Object Number: 2255  Size: SH
  11. Remove the detent plug, spring, and plunger.

  12. Object Number: 2232  Size: SH
  13. Remove the rear extension housing bolts.

  14. Object Number: 2233  Size: SH
  15. Remove the rear extension housing. Tap the extension housing with a rubber hammer in order to free it from the sealer.

  16. Object Number: 2234  Size: SH
  17. Remove the rear bearing retainer snap ring.

  18. Object Number: 2235  Size: SH
  19. Remove the rear retainer housing bolts.
  20. Important: Do not pry against the sealing surfaces.


    Object Number: 2236  Size: SH
  21. Remove the rear retainer housing. Carefully pry upward under each tab on the retainer housing.

  22. Object Number: 2256  Size: SH
  23. Remove the vehicle speed sensor rotor snap ring.

  24. Object Number: 2257  Size: SH
  25. Remove the vehicle speed sensor rotor.

  26. Object Number: 2258  Size: SH
  27. Remove the snap ring from the mainshaft.
  28. Important: Some transfer case models have a bracket attached to them by the case bolts. These bolts are different from the others and must be returned into the correct holes.


    Object Number: 2259  Size: SH
  29. Remove the case bolts. The two longer case bolts and washers go into the doweled holes.
  30. Important: Damage may occur if you attempt to pry the case halves apart at any point on the mating surfaces.


    Object Number: 2260  Size: SH
  31. Separate the case halves.
  32. • Insert screwdrivers into the slots that are molded into the case ends and pry apart.
    • Do not damage the oil pump on the rear case half.

    Object Number: 2261  Size: SH
  33. Remove the oil pump.

  34. Object Number: 2262  Size: SH
  35. Remove the oil pump pickup tube, O-ring, and pump pickup filter.

  36. Object Number: 2263  Size: SH
  37. Remove the mode shift fork spring.

  38. Object Number: 2203  Size: SH
  39. Remove the front output shaft seal.

  40. Object Number: 2264  Size: SH
  41. Remove the front output shaft snap ring.

  42. Object Number: 2265  Size: SH
  43. Remove the mainshaft, drive chain, and driven sprocket assembly. The mode shift fork and the shift rail will be removed with the mainshaft.

  44. Object Number: 2266  Size: SH
  45. Remove the synchronizer to mainshaft snap ring.

  46. Object Number: 2267  Size: SH
  47. Remove the synchronizer assembly.

  48. Object Number: 2268  Size: SH
  49. Remove the drive sprocket.

  50. Object Number: 2284  Size: SH
  51. Remove the shift fork and range shift hub. Rotate the sector shaft in order to obtain clearance for the range fork.

  52. Object Number: 2285  Size: SH
  53. Remove the shift sector snap ring.

  54. Object Number: 2286  Size: SH
  55. Remove the sector shaft assembly.

  56. Object Number: 2271  Size: SH
  57. Remove the input bearing retainer bolts.

  58. Object Number: 2272  Size: SH
  59. Remove the input bearing retainer.

  60. Object Number: 2273  Size: SH
  61. Remove the input gear snap ring.

  62. Object Number: 2274  Size: SH
  63. Use a soft face hammer in order to remove the input and low range gear assembly.

  64. Object Number: 2275  Size: SH
  65. Remove the input gear to low range gear assembly snap ring.

  66. Object Number: 2276  Size: SH
  67. Separate the input gear from the low range gear assembly.

  68. Object Number: 2277  Size: SH
  69. Use the J 36370 and the J 8092 in order to remove the input bearing.

  70. Object Number: 2278  Size: SH
  71. Use the J 29369 , the J 9276-21 , and the J 2619-01 in order to remove the needle bearings from the input gear.

  72. Object Number: 2279  Size: SH
  73. Remove the front output bearing snap ring.

  74. Object Number: 2280  Size: SH
  75. Use the J 33790 and the J 8092 in order to remove the front output bearing.

  76. Object Number: 2281  Size: SH
  77. Remove the seal from the mainshaft extension housing.

  78. Object Number: 2282  Size: SH
  79. Remove the input bearing retainer seal.

  80. Object Number: 2283  Size: SH
  81. Use the J 2619-01 and the J 29369-2 in order to remove the front output rear bearing.

  82. Object Number: 2250  Size: SH
  83. Use the J 33790 in order to remove the mainshaft bearing from the oil pump retainer.

  84. Object Number: 2251  Size: SH
  85. Remove the magnet from the front case.

  86. Object Number: 2252  Size: SH
  87. Disassemble the main drive synchronizer stop rings from the synchronizer sleeve.
  88. • Mark the location of the synchronizer hub and sleeve.
    • The synchronizer teeth must align with the struts.

    Object Number: 2253  Size: SH
  89. Remove the spring retainers from the synchronizer hub.

  90. Object Number: 2254  Size: SH
  91. Separate the synchronizer hub from the synchronizer.
  92. Remove the oil pump screws from the oil pump.