20. Overdrive Overhaul (Case Side)

Removal and Inspection Procedure

^ Tools Required
- J 26900-5 Vernier Caliper





1. Place the feeler gage between the brake flange (2) and the snap ring (1) in order to measure the clearance.
2. Measure the clearance.
^ Brake flange-to-snap ring clearance (standard): 0.35-1.91 mm (0.014-0.075 inch)
3. Replace the clutch disc or plate if the readings are not as specified.
4. Remove the following components from the overdrive case:
^ The brake flange snap ring (1)
^ The brake flange (2)
^ The clutch discs (3)
^ The clutch plates (4)
^ The cushion brake plate (5)
^ The planetary ring gear
^ The thrust bearing races
^ The thrust bearing





5. Remove the following clutch piston return spring components using a flathead screwdriver:
^ The snap ring
^ The retainer
^ The springs





6. Apply low compressed air into the overdrive case (2) fluid hole in order to remove the brake piston (1).
7. Remove the brake piston O-rings.





8. Remove the following components from the rear of the overdrive case.
^ The 2 sealing rings (1)
^ The bearing
^ The bearing race





9. Measure the free length of the clutch piston return springs (1) using J 26900-5.
^ Clutch piston return spring free length (standard): 15.10 mm (0.594 inch)
Replace the springs which are not within specifications.


Installation Procedure

^ Tools Required
- J 36850 Transjel(TM) Transmission Assembly Lubricant





1. Apply J 36850 to the bearing and race.
2. Install the bearing and race to the rear of the overdrive case.
3. Install new seal rings to the rear of the overdrive case.
4. Lubricate the seals with A/T fluid.
5. Install the brake piston.
6. Install the following components into the overdrive case:
^ The 20 piston return springs
^ The piston spring retainer
^ The snap ring (2)
7. Inspect that the snap ring end gap does not align with one of the overdrive case cutouts.
8. Install the following components in the exact order given to the overdrive case after applying J 36850:
8.1. The bearing race
8.2. The thrust bearing
8.3. The thrust bearing race
9. Install the planetary ring gear.
10. Install the cushion brake plate.





11. Install the overdrive clutch plates (1) and discs in the following order:
11.1. The plate
11.2. The plate
11.3. The disc
11.4. The plate
11.5. The disc
12. Install the brake plate.
13. Install the brake plate snap ring, making sure the end gap does not align with any of the overdrive case cutouts.
14. Measure the brake backing plate-to-snap ring clearance using a feeler gage.
^ Brake backing plate-to-snap ring clearance (standard): 0.35-1.91 mm (0.014-0.075 inch)
Disassemble and inspect if the clearance is not within specifications.