This wonderful piece of gearing has appeared on HowStuffWorks in advance of. You could possibly realize it from the electric screwdriver posting. An automatic transmission is made up of two complete planetary gearsets folded jointly into one particular part. See How Gear Ratios Function for an introduction to planetary gearsets. https://gearboxauto29494.articlesblogger.com/56627168/the-smart-trick-of-gearbox-auto-that-no-one-is-discussing