Low/Reverse (1, R) Clutch Hydraulic Circuit Diagram (Applied in Reverse)
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
For the low/reverse (1, R) clutch to apply in PARK, NEUTRAL or manual 1st gear position, the operation is basically the same as in REVERSE except the PC4R circuit is supplied from a different circuit. Shift Solenoid D (SSD) provides regulated solenoid pressure from the SF hydraulic circuit to the direct (3, 5, R) clutch latch valve through the PC4Z hydraulic circuit. With the direct (3, 5, R) clutch latch valve in position to release the direct (3, 5, R) clutch, it opens the PC4Z hydraulic circuit to the PC4R circuit to position the low/reverse (1, R) clutch regulator and latch valves to apply the low/reverse (1, R) clutch.