Forward Clutch Assembly
Forward (1, 2, 3, 4) Clutch Exploded View
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Transmission case |
| 2 | - | Center support |
| 3 | - | Forward clutch piston |
| 4 | - | Forward clutch piston return spring |
| 5 | - | Forward clutch piston snap ring retainer |
| 6 | - | Forward clutch piston snap ring |
| 7 | - | Forward clutch wave spring |
| 8 | - | Forward (1, 2, 3, 4) clutch |
| 9 | - | Forward clutch pressure plate |
| 10 | - | Forward clutch snap ring |
| 11 | - | Front sun gear and shell assembly |
Forward (1, 2, 3, 4) Clutch Cutaway View
Forward (1, 2, 3, 4) Clutch Mechanical Operation
The forward clutch is a brake clutch that holds the front sun gear and shell assembly. The forward clutch is applied in 1st, 2nd, 3rd and 4th gears. A thin wave spring is located around the outside of each forward clutch friction plate to reduce the drag in 5th and 6th gear when the clutch is not engaged.
Hydraulic pressure from the regulator valve in the valve body pushes the forward clutch piston against the forward clutch pack to apply the clutch. The front sun gear and shell assembly is held stationary to the transmission case as a result of the clutch being applied.
Forward (1, 2, 3, 4) Clutch Hydraulic Circuits (Applied in 1st, 2nd, 3rd and 4th gear)
Line pressure is supplied to the 1234 regulator valve by the manual valve in the DRIVE and LOW position. To apply the forward (1, 2, 3, 4) clutch, Shift Solenoid A (SSA) supplies varying solenoid pressure to the 1234 regulator and latch valves. As the regulator valve moves, it supplies the forward (1, 2, 3, 4) clutch and 1234 latch valve with regulated line pressure through the C1234 circuit. The 1234 latch valve directs the regulated line pressure to the opposite side of the 1234 regulator valve through the C1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement. The forward (1, 2, 3, 4) clutch is applied in 1st, 2nd, 3rd and 4th gears and manual LOW position.
Forward (1, 2, 3, 4) Clutch Hydraulic Circuits (Released)
When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gears, solenoid pressure from Shift Solenoid A (SSA) is removed from the 1234 regulator and latch valves which positions the valves to block line pressure and release the forward (1, 2, 3, 4) clutch. When the forward (1, 2, 3, 4) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the forward (1, 2, 3, 4) regulator valve.
In the released position, exhaust backfill supplied to the 1234 regulator and latch valves by the manual valve through the EXH BF circuit is directed to the forward (1, 2, 3, 4) clutch to fill the unused circuits with unpressurized transmission fluid.
For details on valve body hydraulic circuits and solenoid operation.For additional information, refer to: Transmission Description - System Operation and Component Description .