For most regular cars and trucks, availability and past knowledge ultimately identify gearbox decision. Examination drives aid verify what matches personal needs prior to committing to either shifting design and style.  A compound planetary gearset functions like two planetary gearsets merged. Study compound planetary gearsets and an automatic transmissions construction. https://gearboxauto65184.blogoscience.com/40423048/gearbox-auto-things-to-know-before-you-buy