Transmission Rear Case Assemble

Tools Required

• J 8092  Universal Driver
• J 25070  Heat Gun - 500-750 F
• J 44741  Shift Rail Bearing Installer. See Special Tools .
• J 44742  Bearing Installer. See Special Tools .

1. Using the J 25070  , heat the front case for 10-15 minutes.
   Fig 1: Heating Front Case

   Courtesy of GENERAL MOTORS CORP.
IMPORTANT: With the rear case still hot, install the bearing races. Do not allow the rear case to cool.
Fig 2: Installing Shift Rail Bearing - Rear Case
Courtesy of GENERAL MOTORS CORP.
2. Install the shift rail bearing, with the part number up, in the rear case using the J 8092  (1) and the J 44741  (2). See Special Tools . The J 44741  (2) will install the bearing to the proper depth. See Special Tools .
3. Install the countershaft rear bearing in the rear case using the J 8092  (1) and the J 44742  (2). See Special Tools .
   Fig 3: Installing Countershaft Rear Bearing

   Courtesy of GENERAL MOTORS CORP.
4. Lightly lubricate the reverse idler gear, bearings and shaft with GM P/N 12378515 (Canadian P/N 88900701).
5. Install the reverse idler gear in the rear case. The oil grooves on the reverse gear align to the case, or to the output end of the case.
   Fig 4: Installing Reverse Idler Gear

   Courtesy of GENERAL MOTORS CORP.
6. Install the reverse gear idler bearings in the reverse gear.
7. Install the reverse gear idler shaft.
   • The bolt hole end is up.
   • Use the bracket bolt to align the shaft bolt hole with the bolt hole in the case.
8. Install the reverse gear idler shaft bracket.
   Fig 5: Installing Reverse Gear Idler Shaft Bracket

   Courtesy of GENERAL MOTORS CORP.
   • The part numbers on the bracket align away from the case, or up.
   • Align the bracket bolt hole with the case.
   • The bracket will drop in place if squarely set to the case.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Fig 6: Installing Reverse Gear Idler Shaft Bracket Bolt
Courtesy of GENERAL MOTORS CORP.
9. Install the reverse gear idler shaft bracket bolt with a new O-ring seal.

   Tighten:  Tighten the reverse idler gear bracket bolt to 23 N.m (17 lb ft).

10. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads of the back-up lamp switch.
11. Install the back-up lamp switch in the rear case.
    Fig 7: Installing Back-Up Lamp Switch

    Courtesy of GENERAL MOTORS CORP.

    Tighten:  Tighten the back up lamp switch to 20 N.m (15 lb ft).

12. If 4WD, lightly lubricate the mainshaft rear bearing O-ring seal with transmission lubricant GM P/N 12378515 (Canadian P/N 88900701).
13. Install the mainshaft rear bearing O-ring seal in the rear case.
    Fig 8: Installing Mainshaft Rear Bearing O-Ring Seal

    Courtesy of GENERAL MOTORS CORP.