This awesome piece of gearing has appeared on HowStuffWorks before. You may figure out it from the electric screwdriver report. An automatic transmission is made up of two complete planetary gearsets folded with each other into a person component. See How Equipment Ratios Work for an introduction to planetary gearsets. https://gearbox-auto10639.ambien-blog.com/40603535/details-fiction-and-gearbox-auto