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. Object Number: 1293  Size: SH
  10. Remove the vacuum switch and its O-ring.

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

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

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

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

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


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

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

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

  27. Object Number: 2258  Size: SH
  28. Remove the snap ring from the mainshaft.
  29. 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
  30. Remove the case bolts. The two longer case bolts and washers go into the doweled holes.
  31. 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
  32. Separate the case halves.
  33. • 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
  34. Remove the oil pump.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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