RAM 2500 Truck 2WD V8-5.9L VIN Z (1997)
Torque Converter: Description and Operation
GENERAL INFORMATION
The torque converter is a hydraulic device that couples the engine crankshaft to the transmission.
The torque converter consists of an outer shell with an internal turbine, a stator, an overrunning clutch, an impeller, and an electronically applied
converter clutch. Torque multiplication is created when the stator directs the hydraulic flow from the turbine to rotate the impeller in the direction
the engine crankshaft is turning. The turbine transfers power to the planetary gear sets in the transmission. The transfer of power into the impeller
assists torque multiplication. At low vehicle-speed, the overrunning clutch holds the stator stationary (during torque multiplication) and allows the
stator to freewheel at high vehicle speed. The converter clutch engagement reduces engine speed. Clutch engagement also provides reduced
transmission fluid temperatures. The torque converter hub drives the transmission oil (fluid) pump.
The torque converter is a sealed, welded unit that is not repairable and is serviced as an assembly.
CAUTION: The torque converter must be replaced if a transmission failure results in large amounts of metal or fiber contamination in the fluid.
CONVERTER DRAINBACK VALVE
The drainback valve is located in the transmission cooler outlet (pressure) line. The valve prevents fluid from draining from the converter into the
cooler and lines when the vehicle is shut down for lengthy periods. Production valves have a hose nipple at one end, while the opposite end is
threaded for a flare fitting. All valves have an arrow (or similar mark) to indicate direction of flow through the valve.
