This remarkable piece of gearing has appeared on HowStuffWorks before. You could identify it from the electric screwdriver article. An automatic transmission incorporates two complete planetary gearsets folded with each other into a single element. See How Gear Ratios Function for an introduction to planetary gearsets. The final Motors Hydra-Matic https://andycffcz.post-blogs.com/55051940/gearbox-auto-fundamentals-explained