Extension Assemble (MJK, MH3, or MM6)

Special Tools

• DT 48074  Input and Output Shaft Seal Installer
• DT 48802  Bearing Installer
• J 8092  Drive Handle
• J 21426  Outer Output Shaft Seal Installer
• J 36190  Universal Driver Handle
• J 39437  Bushing Installer
• J 39439-3  Rear Case Bushing Installer
• J 39546  Bearing Race Installer
• J 44384  Shifter Fork Bearing Installer

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

1. Courtesy of GENERAL MOTORS COMPANY

   Using J 36190  handle (1) and J 39439-3  installer (2), install the reverse rail bushing.

2. Courtesy of GENERAL MOTORS COMPANY

   Install the shift rail bearing using the J 36190  handle (1) and the J 44384  installer (2).

3. Courtesy of GENERAL MOTORS COMPANY

   Install the seal using the J 36190  handle (1) and J 44384  installer (2).

4. Courtesy of GENERAL MOTORS COMPANY

   Snap the oil funnel into a NEW extension housing countershaft bearing assembly.

5. Using the J 36190  handle (1) and DT 48802  installer (2), install the countershaft bearing.

6. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   The plastic roller bearing cage (2) and bearings (3) are part of the countershaft bearing assembly.

   Install the countershaft rear bearing retainer (1).

7. Courtesy of GENERAL MOTORS COMPANY

   Install the mainshaft bearing race, using the J 39546  installer (1) and the J 8092  drive handle (2).

8. Courtesy of GENERAL MOTORS COMPANY

   Install the mainshaft bearing race retainer ring.

9. Courtesy of GENERAL MOTORS COMPANY

   Install the NEW output shaft seal (1) using the J 8092  drive handle and the DT 48074  input/output Shaft installer.

10. Courtesy of GENERAL MOTORS COMPANY

    Apply sealer GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the transmission case drain plug.

11. Courtesy of GENERAL MOTORS COMPANY

    CAUTION:

    Refer to Fastener Caution .

    Install the transmission case drain plug (2) and tighten to 27 N.m (20 lb ft).

12. Install the vehicle speed sensor (1).
13. Install the vehicle speed sensor bolt and tighten to 11 N.m (96 lb in).

14. Courtesy of GENERAL MOTORS COMPANY

    Install a NEW O-ring onto the reverse lockout assembly (1).

15. Install the reverse lockout assembly into the extension housing.
16. Install the reverse lockout assembly bolt and tighten to 18 N.m (13 lb ft).

17. Courtesy of GENERAL MOTORS COMPANY

    Install the reverse idler gear shaft (1).

18. Courtesy of GENERAL MOTORS COMPANY

    Install the roller bearing and reverse idler gear.

19. Courtesy of GENERAL MOTORS COMPANY

    Apply GM P/N 12345382, (Canadian P/N 10953489) or equivalent to the reverse idler shaft bracket bolt threads.

20. Courtesy of GENERAL MOTORS COMPANY

    Install the reverse idler shaft bracket and bolts. Tighten the bolts to 25 N.m (18 lb ft).