thank you for answer!

I am trying to found now not to expensive differential, but what I found it is used and the price is 1000,00 EUR is it that to expensive ???

For now it is not urgently for me but I'll start for preparation.

I see the "kofer" I miss the price wich one is it ? is it possible to make these tool ? my father working in one factory wich one is specialized for metal stuff. maybe I can try to make one.

But I read in one post, that you have problem when you driving more than 40km/h wit active 4x4 ? what kind of problem can he provide, except spending tire.

For wich price you become your new differential ?

sorry for interrupting, and thank you for helping