The impeller (1) is rotated because of the crankshaft and it converts the mechanical energy of the crankshaft into kinetic Power by Placing the fluid in movement. A widespread problem would be that the bearings during the torque converters are worn. This does not cause slippage or other transmission complications, https://edwinnsssr.kylieblog.com/34805413/how-much-you-need-to-expect-you-ll-pay-for-a-good-torque-converter-clutch