I have been doing some research on replacing the drive shaft on my 00 323iT 5spd. Most references, including the Bentley manual, only discuss removing and reinstalling the original drive shaft as part of replacing the flex disk and/or center bearing. The articles mention marking where the drive shaft mates with the transmission and diff before dissembly in order to put everything back together as it was. Clearly, I won't be able to do this with a brand new replacement drive shaft. Does it really matter since the shaft is balanced or am I asking for trouble? Any tips from anyone who has done this job? Thanks!