Center Support and Gear Unit Assembly Assemble

Tools Required

• J 6116-A  Rear Gear Holding Fixture. See Special Tools .
• J 36850  Transjel® Lubricant

1. Insert the main shaft (662) into the rear internal gear (666).
   Fig 1: View Of Main Shaft, Retainer Ring & Rear Internal Gear

   Courtesy of GENERAL MOTORS CORP.
2. Install the main shaft retainer ring (670) onto the main shaft (662).
3. Install the washer (691) onto the main shaft (662).
   Fig 2: Identifying Main Shaft Components

   Courtesy of GENERAL MOTORS CORP.
4. Install the sun gear rear thrust bearing assembly (664) and bearing races (663, 665) onto the main shaft (662).
5. The lips on the sun gear thrust bearing races (663, 665) should face the sun gear rear thrust bearing assembly (664).
6. Retain the washer, sun gear rear thrust bearing assembly and bearing races with J 36850  or equivalent.
7. Lubricate the output carrier pinion gears (655) with DEXRON®VI transmission fluid.
8. Install the main shaft (662) and the rear internal gear (666) into the output carrier assembly (661).
   Fig 3: Identifying Output Carrier Assembly Components

   Courtesy of GENERAL MOTORS CORP.
9. Place the assembly into the J 6116-A  with the main shaft facing down. See Special Tools .
10. Assemble the rear internal gear thrust bearing assembly (647) and races (648, 669). The lips of the sun gear thrust bearing races (648, 669) should face the rear internal gear thrust bearing assembly (647).
    Fig 4: Assembling Sun Gear Thrust Bearing Races

    Courtesy of GENERAL MOTORS CORP.
11. Place the bearing and race assembly onto the hub of the rear internal gear (666). Retain with J 36850  or equivalent.
12. Install the output shaft assembly (671) into the output carrier assembly (661).
    Fig 5: Output Shaft Components

    Courtesy of GENERAL MOTORS CORP.
13. Install the output shaft retainer ring (672).
14. Install the output shaft thrust washer (673) on the output shaft assembly (671). Align the output shaft thrust washer tabs with the pockets in the output carrier assembly.
15. Retain the thrust washer with J 36850  or equivalent.
16. Turn the gear unit assembly over and place it into the J 6116-A  with the output shaft assembly (671) facing down. See Special Tools .
    Fig 6: Reaction Carrier Assembly

    Courtesy of GENERAL MOTORS CORP.
17. Install the output carrier thrust washer (659) into the output carrier assembly (661).
18. Lubricate the reaction carrier pinion gears (655) with DEXRON®VI transmission fluid.
19. Install the reaction carrier assembly (651) into the output carrier assembly (661).
20. Rotate the reaction carrier assembly (651) to ease installation.
    Fig 7: Rotating Sun Gear During Installation

    Courtesy of GENERAL MOTORS CORP.
21. Install the sun gear (650) into the reaction carrier assembly 651).
    • Insert the chamfered inner diameter first.
    • Rotate the sun gear to ease installation.
22. Insert the sun gear shaft assembly (649) with the long splined end into the sun gear (650).
23. Install the longer-lipped sun gear front thrust bearing race (648) onto the sun gear with the lip facing upward.
    Fig 8: Aligning Longer-Lipped Sun Gear Front Thrust Bearing Race Facing Up

    Courtesy of GENERAL MOTORS CORP.
24. Assemble the sun gear front thrust bearing assembly (647) onto the sun gear front thrust bearing race (648).
25. Install the sun gear front thrust bearing race (646) on the rear hub of the center support assembly (640). Retain the sun gear front thrust bearing race (646) with J 36850  or equivalent.
    Fig 9: View Of Sun Gear Front Thrust Bearing Race, Center Support & Reaction Carrier Thrust Washer

    Courtesy of GENERAL MOTORS CORP.
26. Install the reaction carrier thrust washer (642) (brass) into the recess of the center support assembly (640). Retain the reaction carrier thrust washer (642) with J 36850  or equivalent.
27. Install a new center support assembly (640), or the reconditioned center support assembly, into the reaction carrier assembly (651).
    Fig 10: Identifying Center Support Assembly & Reaction Carrier Assembly

    Courtesy of GENERAL MOTORS CORP.
28. Verify correct installation by holding the reaction carrier assembly (651) stationary and rotating the center support assembly (640). The center support assembly (640) should only turn counterclockwise.