A little rebuild advice needed please :)

Couple tips.
Installing the tail housing can be tricky. Before installing the tail housing gasket,practice putting it together and taking it apart a couple times. Now that your comfortable,put it together with the gasket. This will help you avoid tearing up the gasket. (Ask me how I know).

Another tip is type of oil when you get it back together. The 833 uses a GL-4 oil. GL-4 oil is getting tough to find in the states. It is a special formula made for the soft (brass) syncros. I recommend Redline MT-80 GL-4.
I put that in my trans and it shifted like a brand new tranny. I wont use anything else here on out. Some might recommend ATF, but thats dinosaur technology.

Hope this helps mate.
JD