GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 8001 Dial Indicator Set

For equivalent regional tools, refer to Special Tools.

Note: The shimming procedure is required to be performed during service only when the following parts are replaced:

   • The input shaft
   • The counter shaft
   • The main shaft
   • The adapter plate
   • The main housing
   • The extension housing

Input Shaft, Mainshaft, and Countershaft


    Object Number: 2102308  Size: SH
  1. Rotate the clutch housing to the vertical position.
  2. Install the following assemblies in order:
  3. 2.1. The input shaft (3)
    2.2. Align the 4th speed gear blocking ring to the input shaft.
    2.3. The mainshaft assembly (2)
    2.4. The countershaft (1), lifting up the mainshaft enough to install the countershaft.

    Object Number: 2102309  Size: SH
  4. Install the transmission case (1).
  5. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 2102310  Size: SH
  6. Install the clutch housing to transmission case bolts and tighten to 36 N·m (27 Ib ft).

  7. Object Number: 2102311  Size: SH
  8. Measure the input shaft/mainshaft end play using the following procedure:
  9. 5.1. Place the tip of the J 8001 indicator set  (1) on the end of the mainshaft.
    5.2. Move the main shaft up and down.
    5.3. Record the measurement.
  10. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) preload.
  11. Remove the J 8001 indicator set .

  12. Object Number: 2102312  Size: SH
  13. Measure the countershaft end play using the following procedure:
  14. 8.1. Place the tip of the J 8001 indicator set  (1) on the end of the countershaft.
    8.2. Move the countershaft up and down.
    8.3. Record the measurement.
  15. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) preload.
  16. Remove the J 8001 indicator set .

  17. Object Number: 2102314  Size: SH
  18. Remove the shift lever guide bolts.

  19. Object Number: 2102310  Size: SH
  20. Remove the clutch housing to the transmission case bolts.

  21. Object Number: 2102309  Size: SH
  22. Remove the transmission case.

  23. Object Number: 2102308  Size: SH
  24. Remove the following parts in order:
  25. 14.1. The countershaft (1), lifting up the mainshaft (2) enough to remove the countershaft.
    14.2. The mainshaft assembly (2)
    14.3. The input shaft (3)

    Object Number: 2102316  Size: SH
  26. Remove the input shaft bearing race (1).
  27. Remove the input shaft bearing shim (1) and discard.
  28. Install the new input shaft bearing shim, and the original bearing race.

  29. Object Number: 2102317  Size: SH
  30. Remove the countershaft bearing race (1).
  31. Remove the countershaft bearing shim (2) and discard.
  32. Install the new input shaft bearing shim, and the original bearing race.