The torque converter clutch will come into action to mitigate the inherent inefficiency of the fluid coupling at better speeds. A popular dilemma is that the bearings inside the torque converters are worn. This does not trigger slippage or other transmission problems, but can cause bearing noises in the transmission. https://torque-converter-clutch95173.blogprodesign.com/55589969/how-much-you-need-to-expect-you-ll-pay-for-a-good-torque-converter-clutch