Overdrive & Coast Clutch System

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.

The overdrive and coast clutch system consists of the following:

Overdrive friction clutch assembly
Coast clutch cylinder
Overdrive sun gear
Coast clutch input hub
Coast clutch friction clutch assembly
Overdrive planetary
Overdrive ring gear
Center shaft

The overdrive clutch piston has bonded lip seals. It is installed into the piston bore, cast into the pump and held in place by the return spring. The return spring is attached to the pump with 3 bolts. The overdrive clutch separator plates and pressure plate are splined to the case. The 3 overdrive friction plates are splined to the coast clutch cylinder. The overdrive clutch assembly is positioned between the pump face and a snap ring, and installed into the case adjacent to the overdrive pressure plate. The overdrive sun gear is pressed into the coast clutch cylinder.

The coast clutch piston is also a bonded lip seal type. The coast clutch piston is installed into the coast clutch cylinder and held to the cylinder along with the clutch return spring by a snap ring. The separator plates are splined to the case.

The coast clutch pressure plate is a mechanical diode One-Way Clutch (OWC) assembly. The OWC is splined to the coast clutch cylinder and held in with a snap ring. The coast clutch friction plates are internally splined to the coast clutch hub, which is held to the overdrive carrier by 4 bolts. Absorbing the load between the overdrive carrier and the overdrive sun gear is the "captured" thrust bearing, part of the overdrive planet assembly.

On the opposite side of the overdrive planet is a thrust bearing positioned between the carrier and the shaft. The overdrive ring gear is splined to the center shaft and retained by a snap ring. On the opposite side of the center shaft is a thrust bearing that separates it from the center support. The overdrive coast clutch system is driven clockwise by the input shaft, one end of which is splined to the torque converter cover, and the other end is splined to the overdrive carrier.