I decided to use another rear diff than I originally had planned. This which I’m now going to use has a better LSD and probably it should work as expected. Basically this meant that I needed to dismantle and wash another set of drive shafts and CV joints. But that is now done:
Good thing was that these drive shaft boots were rather good shape and I can now use them to my tractor project. I also optimized CV-joints so that now all little bit worn CV-joints will be used with tractor project and A-class spares are waiting when they are needed with my Sierra.
I will refurbish the diff now left unused some time later when this tractor project is completed.