The torque converter clutch will come into motion to mitigate the inherent inefficiency of the fluid coupling at higher speeds. A prevalent problem is that the bearings from the torque converters are worn. This doesn't result in slippage or other transmission problems, but can cause bearing noises from your transmission. https://torqueconverterclutch75296.mdkblog.com/40099799/top-latest-five-torque-converter-clutch-urban-news