I can tell you a easy way to measure it(which ever
way you wish to do it). If you want to go off of
the drive shaft... car on stands, in neutral, have
the rear U-joint level... now take a socket that
fits the U-joint cup set it on the bottom cup,
take a reading with your protractor on the socket
(the socket is nothing but a spacer). Turn the U-
joint 90* and do the same thing again and look at
the reading, remember that you want the nose lower.
If you take the reading from the trans do the same
thing but only on the yoke side at the trans and
the other reading on the rear U-joint on the diff
side of it..... very simple and you dont pull the
drive shaft