There are plenty of ways of locking the torque converter clutch. These discrepancies are function on the hydraulic circuit managing the clutch actuation. Once the velocity difference between the impeller and turbine is not really way too big, the torque converter clutch is shut plus the link motor to transmission https://spencerlwaeg.blogocial.com/not-known-factual-statements-about-torque-converter-clutch-69996822