Torque Converter

Fig 1: Torque Converter and Torque Converter Lock-Up Clutch Components

Courtesy of FORD MOTOR CO.

The torque converter transmits engine torque hydraulically to the transaxle input shaft.

The stator boosts the torque to the transaxle input shaft (approximately 85% difference in speed between the impeller and the turbine).

The stator is made of synthetic resin to reduce weight.

To increase the efficiency of the automatic transaxle, the torque converter has an apply clutch. When the torque converter lock-up clutch is closed, the torque is transmitted directly from the crankshaft through the torque converter housing to the transaxle input shaft.

The Torque Converter Clutch (TCC) is applied hydraulically by the PCM by means of the solenoid valves in the valve body in 3rd and 4th gears. Apply is dependent on the throttle position, vehicle speed and selector lever position.

Fig 2: Pump and Stator Support Components

Courtesy of FORD MOTOR CO.

The pump is a crescent gear pump and is driven directly from the crankshaft by means of drivers on the converter impeller hub. The pump is bolted to the transaxle housing.

The stator support is part of the pump. Splines on the support locate and hold the converter stator.