307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50	2013 - 2014 MKZ
Description and Operation	Procedure revision date: 09/21/2012

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 lowreverse/ overdrive (4, 5, 6) clutch regulator valve from the pump. To apply the overdrive (4, 5, 6) clutch, Shift Solenoid D (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 Shift Solenoid C (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 (307-01A Automatic Transmission - Vehicles With: 6-Speed Automatic Transmission - 6F50, Description and Operation).