RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Clutch: Description and Operation
Overdrive Clutch
46RE - AUTOMATIC TRANSMISSION
OVERDRIVE CLUTCH / DESCRIPTION
The overdrive clutch (Fig. 134) is composed of the pressure plate, clutch plates, holding discs, overdrive piston retainer, piston, piston spacer, and
snap-rings. The overdrive clutch is the forward most component in the transmission overdrive unit and is considered a holding component. The overdrive
piston retainer, piston, and piston spacer are located on the rear of the main transmission case.
NOTE: The number of discs and plates may vary with each engine and vehicle combination.
OPERATION
To apply the clutch, pressure is applied between the piston retainer and piston. The fluid pressure is provided by the oil pump, transferred through the
control valves and passageways, and enters the clutch through passages at the lower rear portion of the valve body area. With pressure applied between
the piston retainer and piston, the piston moves away from the piston retainer and compresses the clutch pack. This action applies the clutch pack,
allowing torque to flow through the intermediate shaft into the overdrive planetary gear set.
The overdrive clutch discs are attached to the overdrive clutch hub while the overdrive clutch plates, reaction plate, and pressure plate are lugged to the
overdrive housing. This allows the intermediate shaft to transfer the engine torque to the planetary gear and overrunning clutch. This drives the planetary
gear inside the annulus, which is attached to the overdrive clutch drum and output shaft, creating the desired gear ratio. The waved snap-ring is used to
cushion the application of the clutch pack.
