This astounding bit of gearing has appeared on HowStuffWorks prior to. It's possible you'll figure out it from the electrical screwdriver short article. An automatic transmission contains two complete planetary gearsets folded alongside one another into a person ingredient. See How Equipment Ratios Function for an introduction to planetary gearsets. https://manuelpwwwu.full-design.com/new-step-by-step-map-for-gearbox-auto-76521635