snip.....I cleaned the half shafts up and they are ready to go back in. What type of grease should I use? Also the bolts that connect to half shafts to the ZF. There is no washer on the ZF side, just the bolt right? There is a washer on the nut side only?
I use std chassis grease in both the sliding spline zerk and the u-joints- which often do not come pre-greased, by the way. As for the bolts, stock ones are special short-reach bolts with an over-long unthreaded shank; there should be no threads inside the flanges, only outside. A nylock nut is used and a washer is only under the nut if you're using stock bolts. There are aircraft bolts that will work too, in slightly different lengths; those could use a flat AN washer under the bolt head. Finally, if the bolts and nuts are not quite tight, you may get a vibration under hard acceleration. One car had this that traced to a cracked lock-washer and a second one to one of the 16 total halfshaft bolts being just a little bit loose.
