Defective Needle Bearings: Needle bearings inside the torque converter aid easy rotation and energy transfer. Eventually, these bearings can don out or develop into weakened, leading to noise, vibration, and probable failure on the torque converter. A torque converter cannot achieve 100% coupling efficiency. The classic three component torque converter https://torque-converter-clutch28036.thenerdsblog.com/39761277/torque-converter-clutch-fundamentals-explained