Overdrive Clutch Assembly
Overdrive Clutch Exploded View
| Item | Description |
|---|---|
| 1 | Input shaft (part of direct/overdrive clutch assembly) |
| 2 | Overdrive clutch piston inner seal |
| 3 | Overdrive clutch piston outer seals |
| 4 | Overdrive clutch piston |
| 5 | Overdrive clutch piston return spring |
| 6 | Overdrive clutch balance piston |
| 7 | Overdrive clutch balance piston snap ring |
| 8 | Overdrive clutch steel plates |
| 9 | Overdrive clutch friction plates |
| 10 | Overdrive clutch pressure plate |
| 11 | Overdrive clutch snap ring |
| 12 | Overdrive clutch hub thrust bearing |
| 13 | Overdrive clutch hub |
| 14 | Rear sun gear thrust bearing |
| 15 | Rear planetary carrier |
Overdrive Clutch Mechanical Operation
The overdrive clutch is a drive clutch that transfers power from the direct/overdrive hub and shaft assembly to the rear planetary carrier. The overdrive clutch is applied in 4th, 5th and 6th gear.
Hydraulic pressure from the regulator valve in the valve body pushes the overdrive clutch piston against the overdrive clutch pack to apply the clutch. The input shaft transfers torque to the rear planetary sun gear as a result of the clutch being applied.
Overdrive Clutch Hydraulic Circuits (Applied in 4th, 5th and 6th Gear)
When the overdrive clutch is applied in 4th, 5th and 6th gears, LINE pressure is supplied to the low-reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. To apply the overdrive (4, 5, 6) clutch, SSD applies varying solenoid pressure to the CBLR/C456 regulator and boost valves. As the CBLR/C456 regulator valve moves, it supplies the multiplex shift valve assembly and CBLR/C456 boost valve with regulated line pressure through the CBLR/C456 SUPPLY circuit. The CBLR/C456 boost valve directs the regulated line pressure to the opposite side of the CBLR/C456 regulator valve through the CBLR/C456 FDBK circuit for controlled overdrive (4, 5, 6) clutch engagement. The multiplex shift valve directs the regulated pressure to the multiplex manual valve through the C456 SUPPLY hydraulic circuit. The multiplex manual valve directs the regulated pressure to the overdrive (4, 5, 6) clutch through the C456 hydraulic circuit. The C456 circuit also supplies pressure to the CB26 clutch regulator valve to boost the pressure from SSC in 6th gear.
For details on valve body hydraulic circuits and solenoid operation.For additional information, refer to: Transmission Description - System Operation and Component Description .