Cutaway watch of a ZF 8HP transmission: torque converter around the left, planetary gearsets while in the centre, control mechanisms at the bottom The most common design and style of automatic transmissions is the hydraulic automatic, which typically utilizes planetary gearsets which can be operated making use of hydraulics. https://chanceusqok.spintheblog.com/32757539/gearbox-auto-can-be-fun-for-anyone