With no this connection, an auto wouldn't have the ability to come to an entire stop with out killing the engine. Cars and trucks with computerized transmissions don't have any clutch that disconnects the transmission within the engine. As an alternative, they use a tool identified as a torque converter. https://torqueconverterclutch52839.blogdal.com/34705906/the-best-side-of-torque-converter-clutch