This astounding bit of gearing has appeared on HowStuffWorks just before. You could possibly figure out it from the electric screwdriver article. An automatic transmission includes two entire planetary gearsets folded jointly into 1 part. See How Equipment Ratios Work for an introduction to planetary gearsets. What’s a lot more, https://gearbox-auto43074.blog-mall.com/34759501/the-basic-principles-of-gearbox-auto