Oh I forgot about that one. It basically replaces the automatic transmission, starter motor/alternator, clutch and braking system with one simple unit. It has a

Oh I forgot about that one. It basically replaces the automatic transmission, starter motor/alternator, clutch and braking system with one simple unit. It has a total of six fixed gears in a planetary arrangement. Unlike a normal automatic transmission (which quite often fails in older vehicles) it doesn't change gears, so should last a lot longer. Here are some good articles explaining how it works with diagrams: http://prius.ecrostech.com/original/Understanding/PowerSplitDevice.htm http://prius.ecrostech.com/original/Understanding/PowerSplit... http://prius.ecrostech.com/original/Understanding/WhatsGoingOnAsIDrive.htm http://prius.ecrostech.com/original/Understanding/WhatsGoing...