Overdrive and Coast Clutch System

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The overdrive (OD) and coast clutch system consists of the following:

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

The OD 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 OD clutch separator plates and pressure plate are splined to the case. The 3 OD friction plates are splined to the coast clutch cylinder. The OD clutch assembly is positioned between the pump face and a snap ring, and installed into the case adjacent to the OD pressure plate. The OD 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 OD carrier by 4 bolts. Absorbing the load between the OD carrier and the OD sun gear is the "captured" thrust bearing, part of the OD planet assembly.

On the opposite side of the OD planet is a thrust bearing positioned between the carrier and the shaft. The OD 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 OD carrier.