Extension Disassemble (MJK, MH3, or MM6)

Special Tools

• DT 49216  Shift Rail Bearing Remover
• J 23907  Slide Hammer with Bearing Adapter
• J 26941  Bearing Race Remover
• J 29369-2  Bushing and Bearing Remover - 2-3 in
• J 36190  Universal Driver Handle
• J 39431  Fifth/Sixth Driven Gear Puller
• J 39439-1  Bushing Installer
• J 39439-2  Shift Rail Bushing Remover
• J 39439-3  Bushing Installer
• J 45124  Removal Bridge
• J 45124-9  Puller Leg

For equivalent regional tools, refer to Special Tools (MJK, MH3, or MM6) .

1. Courtesy of GENERAL MOTORS COMPANY

   Remove the reverse idler shaft bracket bolts and bracket.

2. Courtesy of GENERAL MOTORS COMPANY

   Remove the reverse idler gear and the roller bearing.

3. Courtesy of GENERAL MOTORS COMPANY

   Remove the reverse idler gear shaft (1).

4. Courtesy of GENERAL MOTORS COMPANY

   Remove the countershaft rear bearing retainer (1).

NOTE:

The plastic roller bearing cage (2) and bearings are part of the countershaft bearing assembly. Always use a new countershaft bearing assembly.

5. Cut away the plastic roller bearing cage (2) from the countershaft bearing assembly.
6. Remove the bearings (3). Discard the cage and bearings.

7. Courtesy of GENERAL MOTORS COMPANY

   Install J 45124-1  removal bridge (1), J 45124-9  puller leg (2), and J 29369-2  remover (3) in the race from the countershaft bearing assembly in the extension housing.

8. Remove the race.

9. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   The bearing race is part of the countershaft bearing assembly. Always use a new countershaft bearing assembly.

   Remove the oil funnel (1) from the bearing race (2). Discard the bearing race.

10. Courtesy of GENERAL MOTORS COMPANY

    Using J 39439-2  remover (2) and J 23907  slide hammer (1), remove the bushing.

11. Courtesy of GENERAL MOTORS COMPANY

    Remove the output shaft seal (1).

    Pry out the seal with a suitable tool.

12. Courtesy of GENERAL MOTORS COMPANY

    Remove the mounting bolt, the reverse lockout assembly (1) and the O-ring.

13. Courtesy of GENERAL MOTORS COMPANY

    Remove the bolt and the vehicle speed sensor (1).

14. Remove the plug (2).

15. Courtesy of GENERAL MOTORS COMPANY

    Remove the mainshaft bearing race retainer ring (1).

16. Courtesy of GENERAL MOTORS COMPANY

    NOTE:

    Do not replace the bearing race unless inspection shows bearing race damage.

    Place the extension housing on a flat work surface. Locate the oil clearance gap between the housing and the main shaft bearing race.

17. Insert a brass drift (1) through the mainshaft opening of the extension housing, into the oil clearance gap. Using a mallet, tap down on the drift to remove the mainshaft bearing race (2).

18. Courtesy of GENERAL MOTORS COMPANY

    Remove the reverse rail bushing using the J 36190  handle (1) and J 39439-2  installer (2).

19. Courtesy of GENERAL MOTORS COMPANY

    Remove the rear housing shift rail seal (1).

20. Courtesy of GENERAL MOTORS COMPANY

    Remove the shift rail bearing using the J 23907  slide hammer (1) and DT 49216  remover (2).