Grand Cherokee 2WD L6-242 4.0L VIN S MFI (1993)
Torque Converter: Description and Operation
Lockup Torque Converter
PURPOSE
A lockup torque converter is used for all applications. The lockup mechanism consists of a sliding clutch piston, clutch springs and the clutch disc
material.
OPERATION
The disc is attached to the converter front cover. The clutch piston and clutch springs are attached to the turbine hub. The springs dampen engine
firing impulses and loads during the initial phase of converter lockup.
Lockup is controlled by valve body solenoid number three and by the lockup relay valve. At lockup speed, the solenoid channels line pressure to
the lockup clutch through the relay valve.
Torque converter lockup occurs in second gear in 1-2 position; third gear in 3 position and third and fourth gear in D position.
