I normally propose you take out the torque converter through the transmission to diagnose it appropriately. In the picture under you may see an in depth area of a torque converter with its primary components. The impeller, stator and turbine have curved vanes which will cause the fluid to stream https://torqueconverterclutch06161.thezenweb.com/not-known-factual-statements-about-torque-converter-clutch-72282658