Garry,
I have a spare driveshaft that I plan to use when i temporarily remove my ZF box to make some repairs on it. As you know, the shaft used with the std box is longer than the one used with the ZF. I replaced the universals on this spare driveshaft. I did need to use a hydraulic press and an arbor to remove and replace the joints. They are the same and it was not an especially tough job with the press. I can see where this would be somewhat difficult though w/o the hydraulic press. Hope this helps--George