Even a nominal degree of oil in use, below centrifugal pressure of rotation can begin to drive the piston and drag the clutch. Figure 6 illustrates a number of the variables among two- and a few-path converters. In a two-passage torque converter clutch actuation technique (as in the pictures over), https://johnnyijhdy.jts-blog.com/33218126/what-does-torque-converter-clutch-mean