Volks I need some help,

On page 39.43 of my Bentley there are 3 notes at the bottom of the page that
concern me:

1. "CAUTION: The installed position of the driveshaft must be noted for
reinstallation. Vibrations due to incorrect installation can cause cracks in
the transmission housing or engine block."

How do you do this? Are they talking about the rotational position that the
drive shaft bolts on to the transmission and the front differential
flanges?... like mark it so the same holes line up when you reinstall it?

2. "align front final drive [front differential] in longitudinal direction
and tighten mounting bolts"
3. "CAUTION: Front final drive alignment must be done to ensure driveshaft
is installed without distortion."

Okay, can anyone tell me what this procedure entails? There have been some
allusions on the list to the effect that this is a special procedure...
I.e., more than just visually assuring that the driveshaft does not bind
before tightening the final drive bolts.

Also, Dr. Rainer mentioned this morning that when removing the drive shaft
that the 8 bolts and nuts are a special locking type that need to be
replaced with new ones... But I can't find this requirement in the
Bentley... any advice on this?

Also, seems someone mentioned replacing the nuts on the final drive (front
differential) as they are supposed to be crimped or locking types that
should be replaced... but I can find nothing in the Bentley on this
either... and I'm not sure the nuts have to be entirely removed since the
front differential may only have to be loosened, not removed.

Thanks for your help,
Bill
90 Westy Syncro