Present day torque converters use electro hydraulic Handle for the lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed applying hydraulic valves. The valves are actuated immediately or indirectly by solenoids. The lifespan of the failing torque converter is unpredictable. It could final a few days https://torqueconverterclutch82692.theideasblog.com/34468545/torque-converter-clutch-for-dummies