So.. I finally got my car back
The lift is actually not as much as I wanted it, but on the other hand I got it on the papers now and it is street-legal. It is maybe around 3,5cm higher now, a lot of the lift get's ruined again by the smaller tires. Before I had 215R14 but now 195R14, but they are mud-terrain! It was very difficult to find 14 inch mud-terrain tires with the correct load-index at all, otherwise I would have gone for bigger tires.
The diff-lock is a customized self produced lock of 4x4 custom cars, which works great! I banged the bus through some nasty mudholes this weekend and it was not really stopping. Also tried to drive on a small quite steep hill but stoped as I feared not to be able to return savely.
So here are some pics:
before the lift, 215 tires:
after the lift, 195 mud terrain:
spring-hanger on the rear-end of the front-spring, front-end is still stock:
rear leaf-springs before the lift:
rear leaf-springs after the lift:
old shocks:
new OME-shocks:
axle with diff-lock mod:
vacuum-activator of the diff-lock:
vacuum-system in the front (note that the compressor below is not part of that system as it was for the old rear shocks):