How do i replace the u joint on 2002 BMW 530i

car has been making a knocking noise during take off 4rm 15-25 mph so im going to replace the u joint but want to make sure i do it correctly.

Asked by for the 2002 BMW 530i
I'm curiously waiting for the results also, since there is no u-joint on Bimmers. There are flex discs or center support bearing. What part# did you order?

mayb dat wat it is cuz it sayz flex u joint
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BMW's don't have u joints....what are you going to replace?
HMMMMM idk cuz theres one at the end of the drive shaft near the rear and thats what ive been told is the problem and ive order the part.