By mechanically linking the turbine to the pump, it generates a ‘lock-up’ ailment, in essence transforming the fluid coupling into a rigid coupling, akin to a locked manual transmission clutch. The LuK converter clutch is rather Lively and will use in almost any gear but commonly from 2nd on up. https://garrettzhkki.fare-blog.com/34399748/helping-the-others-realize-the-advantages-of-torque-converter-clutch