I usually recommend which you take out the torque converter in the transmission to diagnose it appropriately. In the image below you can see a detailed segment of a torque converter with its major components. The impeller, stator and turbine have curved vanes which causes the fluid to stream In https://torqueconverterclutch06161.thezenweb.com/not-known-factual-statements-about-torque-converter-clutch-72282658