Hi, selling me Chain driven diff.its brand new and still inthe box with full instructions on how to use it.This wee item allows you to convert your car {mostly classic minis}to run with a motorcycle in the front or back .This can also be used on motor cycle engined trikes as it allows power to be properly spred over both wheels .Have a look on you tube to see some videos,type in motor cycle powered cars .No offers this is a expensive bit of kit . May part exchange for bike 100 cc up even on that needs work.Thanks