Grand Cherokee 4WD V8-5.2L VIN Y (1998)
Torque Converter Clutch: Description and Operation
Converter clutch engagement in third or fourth gear range is controlled by sensor inputs to the Powertrain Control Module (PCM). Inputs that
determine clutch engagement are: coolant temperature, engine rpm, vehicle speed, throttle position, and manifold vacuum. The torque converter clutch
is engaged by the clutch solenoid on the valve body. The clutch can be engaged in third and fourth gear ranges depending on overdrive control switch
position. If the overdrive control switch is in the normal ON position, the clutch will engage after the shift to fourth gear, and above approximately 72
km/h (45 mph). If the control switch is in the OFF position, the clutch will engage after the shift to third gear, at approximately 56 km/h (35 mph) at
light throttle.
