This incredible bit of gearing has appeared on HowStuffWorks right before. It's possible you'll figure out it from the electrical screwdriver write-up. An automatic transmission is made up of two total planetary gearsets folded together into a person component. See How Gear Ratios Work for an introduction to planetary gearsets. https://emilianoyhmoq.blogdemls.com/34035659/gearbox-auto-an-overview