S (stall position): With this level the turbine velocity is zero and also the impeller is rotating; the efficiency while in the stall issue is minimal, all-around 50%, which implies that half of the power coming with the engine is lost through friction and dissipated as warmth; at this time https://torque-converter-clutch52727.ampblogs.com/top-torque-converter-clutch-secrets-70942345