Direct Clutch Assembly. Description and Operation

Direct (3, 5, R) Clutch Exploded View

Direct (3, 5, R) Clutch Sectional View

Direct (3, 5, R) Clutch Mechanical Operation

The direct clutch is a drive clutch that transmits power from the direct/overdrive clutch hub assembly to the rear planetary sun gear and housing assembly. The direct clutch is applied in 3rd and 5th gears and provides reverse.

Hydraulic pressure from the regulator valve in the valve body pushes the direct clutch piston against the direct clutch pack to apply the clutch. The input shaft and direct/overdrive clutch hub assembly transmits torque to the rear planetary sun gear and housing assembly as a result of clutch engagement.

Direct (3, 5, R) Clutch Hydraulic Circuits (Applied in 3rd and 5th Gears)

When the direct (3, 5, R) clutch is applied in 3rd and 5th gears, line pressure from the pump is routed to the clutch bypass control valve and manual valve through the DRIVE hydraulic circuit. The clutch bypass control valve directs pressure to the 35R regulator valve through the TCC regulator valve, DRIVE 2 circuit, DRIVE 2/C35R FD shuttle ball, and DRIVE 2/C35R FD circuit.

To apply the direct (3, 5, R) clutch, the SSB supplies variable solenoid pressure to the 35R regulator and latch valves. When the 35R regulator valve moves, it supplies regulated line pressure to the direct (3, 5, R) clutch and the 35R check valve through the C35R circuit. The 35R check valve directs regulated line pressure to the opposite side of the regulator valve through the C35R FDBK circuit for smooth direct (3, 5, R) clutch application.

Direct (3, 5, R) Clutch Hydraulic Circuits (Applied in Reverse)

When the direct (3, 5, R) clutch is applied in REVERSE, line pressure from the manual valve is routed to the clutch bypass control valve through the REVERSE circuit. Pressure in the REVERSE circuit positions the clutch bypass control valve and supplies pressure to the direct (3, 5, R) clutch apply circuit. Pressure from the clutch bypass control valve is supplied to the 35R regulator valve through the C35R FD circuit, DRIVE 2/C35R FD shuttle ball, and DRIVE 2/C35R FD circuit.

To apply the direct (3, 5, R) clutch, the SSB supplies variable solenoid pressure to the 35R regulator and latch valves. When the regulator valve moves, it supplies regulated line pressure to the direct (3, 5, R) clutch and the 35R check valve through the C35R circuit. The 35R check valve directs regulated line pressure to the opposite side of the 35R regulator valve through the C35R FDBK circuit for smooth direct (3, 5, R) clutch application.

Direct (3, 5, R) Clutch Hydraulic Circuits (Released)

When the direct (3, 5, R) clutch is released, solenoid pressure from the SSB is removed from the 35R regulator and check valves, which position the valves to block line pressure and release the direct (3, 5, R) clutch. When the direct (3, 5, R) clutch is released in PARK or NEUTRAL, line pressure is not supplied to the 35R regulator valve.

Supply pressure compensator is supplied to the 35R regulator valve from the pressure regulator control body through the COMP FD circuit and is applied to the opposite side of the direct (3, 5, R) and overdrive (4, 5, 6) clutch pistons to prevent centrifugal clutch apply. COMP FD pressure is only about 83 kPa (12 psi) and acts on all gears. When the direct (3, 5, R) clutch is released, COMP FD is applied through the 35R regulator valve to the direct (3, 5, R) clutch to fill the unused circuit.

For detailed information on valve body hydraulic circuits and solenoid operation, refer to
For additional information, refer to: Transmission Description - System Operation and Component Description (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Description and Operation).

Direct (3, 5, R) Clutch Fluid Passages