Defective Needle Bearings: Needle bearings inside the torque converter facilitate clean rotation and power transfer. Eventually, these bearings can put on out or turn into damaged, resulting in sounds, vibration, and possible failure with the torque converter. In a two-passage torque converter clutch actuation process (as in the pictures over), https://archerbmvdj.dgbloggers.com/34419342/torque-converter-clutch-fundamentals-explained