GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1997 🢒 Isuzu - N Series 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Center Support and Gear Unit Assembly Assemble

Tools Required

    • J 6116-A Rear Gear Holding Fixture
    • J 36850 Assembly Lubricant

    Object Number: 54575 Size: SH
  1. Assemble the main shaft (662) into the rear internal gear (666).
  2. Install the main shaft retaining ring (670) onto the main shaft (662).

    3. Object Number: 54579 Size: SH
  3. Assemble the sun gear rear thrust bearing (664) and races (663 and 665) onto the main shaft (662).
  4. The lips on the sun gear thrust bearing races (663 and 665) should face the sun gear rear thrust bearing (664).
  5. Retain the sun gear rear thrust bearing and races with J 36850 or equivalent.

    6. Object Number: 28722 Size: SH
  6. Lubricate the output carrier pinion gears (655) with DEXRON® III transmission fluid.
  7. Assemble the main shaft and rear internal gear assembly (666) into the output carrier assembly (661).
  8. Place the assembly into the J 6116-A with the main shaft facing down.

    9. Object Number: 54649 Size: SH
  9. Assemble the sun gear front thrust bearing (647) and races (648 and 669). The lips of the sun gear thrust bearing races (648 and 669) should face the sun gear front thrust bearing (647).
  10. Place the bearing and race assembly onto the rear internal gear hub. Retain with J 36850 or equivalent.

    11. Object Number: 28725 Size: SH
  11. Assemble the output shaft (671) into the output carrier assembly.
  12. Install the output shaft retainer ring (672).
  13. Assemble the output shaft thrust washer (673) (plastic) to the output shaft.
  14. Retain the thrust washer with J 36850 or equivalent.
  15. Align the output shaft thrust washer tabs with the pockets in the output carrier.

    16. Object Number: 54584 Size: SH
  16. Turn the gear unit assembly over and place it into the J 6116-A with the output shaft (671) facing down.
  17. Install the front internal/reaction carrier thrust washer (659) into the output carrier assembly (661).
  18. Lubricate the reaction drum carrier pinion gears with DEXRON® III transmission fluid.
  19. Assemble the reaction drum and carrier assembly (651) into the output carrier assembly (661).
  20. Rotate the reaction drum and carrier assembly (651) to ease assembly.

    21. Object Number: 54593 Size: SH
  21. Assemble the sun gear (650) into the reaction drum and carrier assembly (651).
    22. • Insert the chamfered inner diameter first
    • Rotate the sun gear to ease assembly
  22. Assemble the sun gear shaft (649) with the long splined end into the sun gear (651).

    23. Object Number: 54600 Size: SH
  23. Assemble the longer lipped sun gear rear thrust bearing race (648) onto the sun gear with the lip facing upward.
  24. Assemble the sun gear front thrust bearing (647) onto the sun gear rear thrust bearing race (648).

    25. Object Number: 54607 Size: SH
  25. Assemble the sun gear front thrust bearing race (646) to the rear hub of the center support (640). Retain the sun gear front thrust bearing race (646) with J 36850 or equivalent.
  26. Assemble the reaction carrier thrust washer (642) (brass) into the recess of the center support. Retain the reaction carrier thrust washer (642) with J 36850 or equivalent.

    27. Object Number: 28733 Size: SH
  27. Install a new center support (640), or the reconditioned center support, into the reaction carrier (651).
  28. Verify correct assembly by holding the reaction carrier (651) stationary and by rotating the center support (640). The center support (640) should only turn counterclockwise.