The control of the oil tension within the lock-up clutch is done through two valves: the relay valve and the sign valve. In this kind of arrangement the sign valve controls the tension on one side of the relay valve, which controls the tension during the lock-up clutch. By default, https://brooksvbdfe.suomiblog.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-torque-converter-clutch-49880916