GM Service Manual Online
For 1990-2009 cars only

Assembly Procedure

Tools Required

    • J 8092 Universal Driver Handle
    • J 33833 Front Case Bearing Installer
    • J 36372 Input Sungear Needle Bearing Installer
    • J 33843 Rear Extension Seal Installer
    • J 33831 Input Seal Installer
    • J 33832 Bearing Installer

    Important: Use Dextron® III automatic transmission fluid or the equivalent for lubricant during assembly.


    Object Number: 3004  Size: SH
  1. Use the J 33832 and the J 8092 in order to install the needle bearings. The bearing must be flush with the boss on the case housing.

  2. Object Number: 3005  Size: SH
  3. Use the J 33833 and the J 8092 in order to install the front output bearing.

  4. Object Number: 2279  Size: SH
  5. Install the front output bearing snap ring.

  6. Object Number: 3006  Size: SH
  7. Use the J 33833 and the J 8092 in order to install the bearing into the rear retainer housing.

  8. Object Number: 3007  Size: SH
  9. Use the J 36372 and the J 8092 in order to install the input gear bearing.

  10. Object Number: 2276  Size: SH
  11. Install the input gear assembly into the planetary carrier.

  12. Object Number: 2275  Size: SH
  13. Install the input gear snap ring.

  14. Object Number: 3008  Size: SH
  15. Use the J 36372 in order to install the input bearing.

  16. Object Number: 3009  Size: SH
  17. Use the J 33843 in order to install the mainshaft extension housing seal. Lubricate the seal sealing lips with automatic transmission fluid.

  18. Object Number: 3011  Size: SH
  19. Use the J 33831 in order to install the input bearing seal into the input bearing retainer. Lubricate the seal sealing lips with automatic transmission fluid.

  20. Object Number: 2251  Size: SH
  21. Install the magnet into the front case half.

  22. Object Number: 2254  Size: SH
  23. Install the synchronizer hub to the synchronizer sleeve. Ensure that the marks are aligned.

  24. Object Number: 2253  Size: SH
  25. Install the synchronizer hub spring retainers.

  26. Object Number: 2252  Size: SH
  27. Install the synchronizer stop rings.

  28. Object Number: 2268  Size: SH
  29. Install the synchronizer drive sprocket.

  30. Object Number: 2267  Size: SH
  31. Install the synchronize assembly.

  32. Object Number: 2266  Size: SH
  33. Install the synchronizer snap ring.

  34. Object Number: 2274  Size: SH
  35. Use a soft faced hammer in order to install the input and low range gear assembly.

  36. Object Number: 2273  Size: SH
  37. Install the input gear snap ring.

  38. Object Number: 2272  Size: SH
  39. Install the input bearing retainer. Apply RTV on the bearing retainer mating surfaces.

  40. Object Number: 3012  Size: SH
  41. Install the input bearing retainer bolts. Apply threadlocker to the bearing retainer bolts.
  42. Tighten
    Tighten the bolts to 19 N·m (14 lb ft).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 2286  Size: SH
  43. Install the shift sector assembly.

  44. Object Number: 2285  Size: SH
  45. Install the sector shaft snap ring.

  46. Object Number: 2284  Size: SH
  47. Install the range shift hub and fork. Rotate the sector in order to align the range shift fork.

  48. Object Number: 2265  Size: SH
  49. Install the drive chain, mainshaft, and driven sprocket assembly.
  50. 25.1. Install the chain over the mainshaft onto the drive gear. Install the mainshaft assembly, the chain, and the front output shaft as an assembly.
    25.2. Fit the mainshaft assembly, the mode shift fork, and the rail through the range shift fork in the front case half.

    Object Number: 2263  Size: SH
  51. Install the fork shift spring.

  52. Object Number: 2262  Size: SH
  53. Install the oil pump pickup tube and screen into the rear case. Pump failure may occur if the O-ring is damaged during installation.

  54. Object Number: 2261  Size: SH
  55. Install the oil pump onto the pickup tube. Apply RTV sealer to the case mating surfaces.

  56. Object Number: 3014  Size: SH
  57. Install the rear case to the front case.
  58. • Slide the rear case over the mainshaft onto the front case.
    • Be careful not to damage the oil pump.

    Object Number: 3016  Size: SH
  59. Apply threadlocker to the case bolts. The two longer case bolts and washers go into the doweled case holes.
  60. Install the case bolts.
  61. Tighten
    Tighten the bolts to 31 N·m (23 lb ft).


    Object Number: 2258  Size: SH
  62. Install the mainshaft snap ring.

  63. Object Number: 2257  Size: SH
  64. Install the vehicle speed sensor rotor.

  65. Object Number: 2256  Size: SH
  66. Install the vehicle speed sensor rotor snap ring.

  67. Object Number: 2236  Size: SH
  68. Install the rear retainer housing. Apply RTV sealer to the rear retainer housing to rear case joint.

  69. Object Number: 2238  Size: SH
  70. Install the pump retainer housing bolts.
  71. Tighten
    Tighten the bolts to 41 N·m (30 lb ft).


    Object Number: 2234  Size: SH
  72. Install the output bearing snap ring.

  73. Object Number: 2233  Size: SH
  74. Apply RTV sealer to the extension housing mating surfaces.
  75. Install the rear extension housing.

  76. Object Number: 2237  Size: SH
  77. Apply threadlocker to the rear extension housing bolts.
  78. Install the rear extension housing bolts.
  79. Tighten
    Tighten the bolts to 31 N·m (23 lb ft).


    Object Number: 3017  Size: SH
  80. Install the detent plug, spring, and plunger.
  81. Tighten
    Tighten the detent plug to 15 N·m (11 lb ft).


    Object Number: 2242  Size: SH
  82. Install the vehicle speed sensor O-ring to the vehicle speed sensor.
  83. Install the vehicle speed sensor.
  84. Tighten
    Tighten the speed sensor to 31 N·m (23 lb ft).


    Object Number: 3019  Size: SH
  85. Install the vacuum switch and its O-ring.
  86. Tighten
    Tighten the vacuum switch to 24 N·m (17 lb ft).


    Object Number: 2220  Size: SH
  87. Install the electronic shift motor.

  88. Object Number: 2221  Size: SH
  89. Install the electronic shift motor bolts.
  90. Tighten
    Tighten the bolts to 18 N·m (13 lb ft).


    Object Number: 2204  Size: SH
  91. Use the J 33843 in order to install the front output shaft seal. Lubricate the seal sealing lips with automatic transmission fluid.

  92. Object Number: 2264  Size: SH
  93. Install the front output shaft snap ring.