Transmission Front Case Assemble

Tools Required

• J 8092  Universal Driver
• J 21465-13  Drive Handle Extension. See Special Tools .
• J 25070  Heat Gun - 500-750 F
• J 44741  Shift Rail Bearing Installer. See Special Tools .
• J 44745  Countershaft Bearing Race Installer. See Special Tools .
• J 44746  Mainshaft/Input Shaft Bearing Race Installer. See Special Tools .

1. Apply Teflon sealer GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the transmission vent.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Fig 1: Installing Transmission Vent
Courtesy of GENERAL MOTORS CORP.
2. Install the transmission vent.

   Tighten:  Tighten the transmission vent to 10 N.m (88 lb ft).

3. Install a new power take-off (PTO) cover gasket to the case.
4. Install the PTO cover.
   Fig 2: Installing PTO Cover

   Courtesy of GENERAL MOTORS CORP.
5. Clean the old threadlocker from the PTO cover bolt threads.
6. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the PTO cover bolts.
7. Install the PTO bolts.

   Tighten:  Tighten the PTO cover bolts in a cross torque pattern to 38 N.m (28 lb ft).

8. Using the J 25070  , heat the front case for 10-15 minutes.
   Fig 3: Heating Front Case

   Courtesy of GENERAL MOTORS CORP.
IMPORTANT: With the front case still hot, install the bearing races. Do not allow the front case to cool.
Fig 4: Installing Shift Rail Bearing - Front Case
Courtesy of GENERAL MOTORS CORP.
9. Install the shift rail bearing, with the part number up, in the front case using the J 8092  (1) and the J 44741  (2). See Special Tools . The J 44741  (2) will position the bearing to the proper depth. See Special Tools .
IMPORTANT: With the front case still hot, install the bearing races. Do not allow the front case to cool.
Fig 5: Installing Countershaft Front Bearing Race
Courtesy of GENERAL MOTORS CORP.
10. Install the countershaft front bearing race using the J 8092  (1), J 21465-13  (2), and the J 44745  (3). See Special Tools .

    Do not install the countershaft bearing shims at this time. The shims will be installed after the preload is determined.

11. Install the mainshaft front bearing race using the J 8092  (1), J 21465-13  (2), and the J 44746  (3). See Special Tools .

    Do not install the mainshaft front bearing shims or the oil deflector at this time. The shims and the oil deflector will be installed after the preload is determined

    Fig 6: Installing Mainshaft Front Bearing Race

    Courtesy of GENERAL MOTORS CORP.
12. Allow the front case to cool.