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OVERALL SYSTEM AT-25 [RL4R01A] D E F G H I J K L M A B AT Overrun clutch reducing valve Controls pressure that operates the overrun clutch to relief shocks caused during 4th speed cut valve Determines lock-up speed while operating in 4th gear. ● Torque converter clutch control valve ● Torque converter clutch solenoid valve Activates or deactivates lock-up system. Torque converter relief valve Prevents abnormal increase of converter oil pressure. Valve Name Function |