Most of us enjoy the smooth and effortless feeling of driving in an automatic transmission car. The driving is effortless because you don’t need to worry about gear changing and you don’t have a clutch pedal to operate. In an automatic transmission car the work, of the clutch pedal, is automatically done by a hidden component, which is truly an engineering marvel, the torque converter. The torque converter can even multiply the torque. Let’s see how this purely mechanical device performs its tasks.