Grumpy,
I wish you would have said that earlier, as i have put it back together all greased up and ready to go. There was a gear welded to the long shaft(sits next to the sprocket), each of the four bolts that hold the diff together has a small gear on it. Two facing in(on the diagonal) and two out(all inside the housing ring). Each gear is on its own bush ( i guess it would be called that) and the short larger shaft has a gear welded to it. So it is gear, two small gears diagonally from each other meshed together, then the other two small gears facing the other way mesh together and drive the other gear. I wish i had taken photo's now. It is not that hard and not too many bits to worry about.
