F 250 4WD LD Pickup V8-5.4L SOHC VIN L (1997)
Clutch: Description and Operation
Overdrive Clutch
The overdrive one-way clutch transmits engine torque from the overdrive sun gear to the overdrive ring gear in first, second and third gear range. The
overdrive one-way clutch transmits power when the sprays are engaged between the inner and outer races. The inner race is splined to the coast clutch
cylinder, which in turn is splined to the overdrive sun gear. The outer race is splined to the overdrive ring gear.
The overdrive one-way clutch engages whenever the overdrive planetary system attempts to drive the overdrive sun gear clockwise when the overdrive
ring gear has a counterclockwise torque from the vehicle. When torqued counterclockwise, the overdrive one-way clutch engages and acts as a wedge to
lock the sun gear and the ring gear together. During coast, the overdrive one-way clutch enables the ring gear to overrun or spin at a faster rate than the
sun gear.
The overdrive one-way clutch overruns when in overdrive (fourth gear). In overdrive, the coast clutch cylinder is held by the overdrive one-way clutch,
which in turn holds the overdrive sun gear. This causes the overdrive planet assembly to walk about the sun gear and overdrive the overdrive ring gear.
The inner race of the overdrive one-way clutch is thus held stationary while the outer race is allowed to overrun clockwise.
