Tools Required

J 45185  Bore Gage Set. See Special Tools .

Fig 1: Identifying Input Shaft Thrust Bearing, Front Sun Gear Assembly & Rear Sun Gear Thrust Bearing
Courtesy of GENERAL MOTORS CORP.
1. Remove the input shaft thrust bearing (540).
2. Remove the front sun gear assembly (544).
3. Remove the rear sun gear thrust bearing (538).
Fig 2: View Of Rear Internal Gear, Thrust Bearing & Thrust Bearing Race
Courtesy of GENERAL MOTORS CORP.
4. Remove the rear sun gear thrust bearing race (537).
5. Remove the rear internal gear (536).
6. Remove the rear internal gear thrust bearing (535).
Fig 3: View Of Front Carrier Assembly
Courtesy of GENERAL MOTORS CORP.
7. Remove the front carrier thrust bearing race (543).
8. Remove the front carrier assembly (542).
Fig 4: View Of Rear Internal Gear Flange Retaining Ring & Rear Internal Gear
Courtesy of GENERAL MOTORS CORP.
9. Remove the rear internal gear flange retaining ring (548) from the rear internal gear (536).
10. Remove the rear internal gear flange (547) from the rear internal gear.
11. Remove the other rear internal gear flange retaining ring (548).
Fig 5: Identifying Rear Internal Gear
Courtesy of GENERAL MOTORS CORP.
12. Clean the rear internal gear and air dry.
13. Inspect the rear internal teeth for the following:
    • Chips
    • Cracks
    • Excessive wear
    • Metal debris embeded in teeth
14. Replace the rear internal gear if any of the above conditions are found.
Fig 6: View Of Rear Internal Gear Flange Retaining Ring & Rear Internal Gear
Courtesy of GENERAL MOTORS CORP.
15. Install a rear internal gear flange retaining ring (548).
16. Install the rear internal gear flange (547) in the rear internal gear (536).
17. Install the other rear internal gear flange retaining ring (548).
18. If the rear sun gear bushing is not within specifications or any of the above conditions are found, replace the rear sun gear.
Fig 7: Measuring Inner Diameter Of Rear Internal Gear Bushing
Courtesy of GENERAL MOTORS CORP.
19. Clean the front carrier assembly (542) and air dry. Ensure to remove all solvent in the pinion gears.
20. Inspect the front carrier assembly pinion teeth for the following conditions:
    • Chips
    • Cracks
    • Excessive wear
    • Metal debris embeded in teeth
21. Inspect for missing washers on both sides of the pinion gears.
22. Inspect the front carrier bushing for scoring or excessive wear.
23. Using J 45185  and a micrometer measure the front carrier bushing inner diameter (A). See Special Tools . Measure in three locations and take the average.

    Specification:  Front carrier bushing: 30.056-30.132 mm (1.183-1.186 in)

24. If the front carrier bushing is not within specifications or any of the above conditions are found, replace the front carrier assembly.
Fig 8: Identifying Front Sun Gear
Courtesy of GENERAL MOTORS CORP.
25. Clean the front sun gear (544) and air dry.
26. Inspect the front sun gear teeth for the following conditions:
    • Chips
    • Cracks
    • Excessive wear
    • Metal debris embeded in teeth
27. Inspect the rear sun gear teeth for the following:
    • Chips
    • Cracks
    • Excessive wear
    • Metal debris embeded in teeth
28. Inspect the front sun gear shaft for excessive wear or scoring at the front carrier assembly bushing area.
29. Using J 45185  and a micrometer measure the bushing inner diameter (A). See Special Tools . Measure in three locations and take the average.

    Specification:  Front sun gear bushing: 22.200-22.276 mm (0.874-0.877 in)

30. If the front sun gear bushings are not within specifications or any of the above conditions are found, replace the front sun gear.
Fig 9: Inspecting Bushing
Courtesy of GENERAL MOTORS CORP.
31. Inspect the bushing for scoring or excessive wear.
32. Using J 45185  and a micrometer measure the rear sun gear bushing inner diameter (A). See Special Tools . Measure in three locations and take the average.

    Specification:  Rear sun gear bushing: 22.200-22.276 mm (0.874-0.877 in)