I have continued the process of bringing the M5 to a pristine condition and changed the 3 differential bushings, 2 transmission mountings, CV joint, guibo and centre bearing among other things.
Since I have some more money to spare - and I hear a metal clink when driving slowly with open window when braking/accelerating or changing gears - I am thing the cross joint is next.
A new one is close to 1000 euros.
There few second hand one in the US for around 300 $, but the postage will be probably the same.
From what I gather and from the discussion (over the phone) with a specialized kardan service, they change the cross-joint with a new one. I was given few options by them to exchange the cross with a Chinese, Turkish or Polish cross-joints with prices ascending in that order.
something like this:
BMW E39 520 d 520 523 525 d td tds 528 530 d 530 535 540 M5 PROPSHAFT JOINT | eBay
I would have gladly go with the higher option, but they refuse to give warranty on that (the argument being "I know you BMW folks and the way you drive" BS, even though he would give warranty on a thousand Nm truck rebuilt shaft, but anyway...).
Any way my question is:
Who makes the genuine cross-joints for BMW shafts?
What is the replacement of a similar / better quality?