the right choice of rear axles

I haven't done it yet, but I can already tell you, yes I will be. "Then you have nothing to change" really isn't true. You didn't ask about the drive shaft, which I will have to change. But that's no big deal.
for the driveshaft, that doesn't pose too much a problem, I work very often with a very competent Belgian company
if you have a suggestion to offer me i am at your disposal