Countershaft Extension

^ Tools Required:
- J 8001 Dial Indicator Set
- J 39444-2 Countershaft Extension End Play Rod
- Or Equivalent

Important: The following procedure cannot be performed accurately until the countershaft shimming procedure has been completed and the transmission has been assembled to the point of installing the countershaft extension.





1. Rotate the transmission in the horizontal position.
2. Install the countershaft extension to the countershaft. Make sure the splines fully engage.





3. Install the extension housing and the extension housing retainer bolts.
- Tighten the bolts to 35 Nm (26 ft. lbs.).





4. Remove the plug from the adapter plate.





5. Install the J 39444-2 through the adapter plate plug hole.
6. Screw J 39444-2 into the countershaft extension.





7. Measure the countershaft extension end play:
a. Install a J 8001 so the tip is on the end of the countershaft extension end play rod.
b. Rotate the transmission in the vertical position.
c. Move the countershaft extension up and down using the J 39444-2.
d. Record the measurement.
8. Select a shim to achieve 0.05-0.13 mm (0.002-0.005 inch) axial play.
9. Remove the J 8001.
10. Remove the J 39444-2.





11. Apply sealant to the plug threads. Use GM P/N 1052080 or the equivalent.





12. Install the adapter plate plug.
- Tighten the plug to 27 Nm (20 ft. lbs.).





13. Remove the extension housing bolts and the extension housing.





14. Remove the countershaft extension.
15. Remove the countershaft extension bearing race.