This awesome bit of gearing has appeared on HowStuffWorks before. Chances are you'll acknowledge it from the electrical screwdriver write-up. An automatic transmission has two total planetary gearsets folded alongside one another into a single element. See How Gear Ratios Get the job done for an introduction to planetary gearsets. https://jaidenwbbay.luwebs.com/34835715/not-known-facts-about-gearbox-auto