Extension Disassemble (MG9)

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 .

Fig 1: Reverse Idler Shaft Bracket & Bolts
Courtesy of GENERAL MOTORS COMPANY
1. Remove the reverse idler shaft bracket bolts and bracket.
Fig 2: Reverse Idler Gear And Roller Bearing
Courtesy of GENERAL MOTORS COMPANY
2. Remove the reverse idler gear and the roller bearing.
Fig 3: Reverse Idler Gear Shaft
Courtesy of GENERAL MOTORS COMPANY
3. Remove the reverse idler gear shaft (1).
Fig 4: Countershaft Rear Bearing Components
Courtesy of GENERAL MOTORS COMPANY
4. 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.
Fig 5: Removing Countershaft Extension Bearing Race
Courtesy of GENERAL MOTORS COMPANY
7. 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.
Fig 6: Oil Funnel & Bearing Race
Courtesy of GENERAL MOTORS COMPANY
NOTE:

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

9. Remove the oil funnel (1) from the bearing race (2). Discard the bearing race.
Fig 7: Removing Bushing
Courtesy of GENERAL MOTORS COMPANY
10. Using J-39439-2  remover (2) and J-23907  slide hammer (1), remove the bushing.
Fig 8: Output Shaft Seal
Courtesy of GENERAL MOTORS COMPANY
11. Remove the output shaft seal (1).

    Pry out the seal with a suitable tool.

Fig 9: Roller Bearing & Snap Ring
Courtesy of GENERAL MOTORS COMPANY
12. Remove the snap ring (1) and the roller bearing (2).
Fig 10: Reverse Lockout Assembly
Courtesy of GENERAL MOTORS COMPANY
13. Remove the mounting bolt, the reverse lockout assembly (1) and the O-ring.
Fig 11: Transmission Case Drain Plug & Vehicle Speed Sensor
Courtesy of GENERAL MOTORS COMPANY
14. Remove the bolt and the vehicle speed sensor (1).
15. Remove the plug (2).
Fig 12: Mainshaft Bearing Race Retainer Ring
Courtesy of GENERAL MOTORS COMPANY
16. Remove the mainshaft bearing race retainer ring (1).
Fig 13: Removing Mainshaft Bearing Race
Courtesy of GENERAL MOTORS COMPANY
NOTE:

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

17. Place the extension housing on a flat work surface. Locate the oil clearance gap between the housing and the main shaft bearing race.
18. 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).
Fig 14: Removing Reverse Rail Bushing
Courtesy of GENERAL MOTORS COMPANY
19. Remove the reverse rail bushing using the J-36190  handle (1) and J-39439-2  installer (2).