Lego Differential

Hi, Here i'm going to show you how i made a lego differential as part of an ongoing project. i did not know at the time you could buy these from Lego as a premade part!!!
My first attempt was massive, so have now made it smaller as the first was bigger than the wheels i was using.

This is my first instructable
it does require a freewheeling sprocket/cog, and sacrifice of one piece that needs cutting in half!
Also made a 5 speed gearbox that moves like a real gated gearbox!