thanks I am of the same opinion.So, I had the pleasure of having my ADG Drive go out on my "04" Flair Red. THAT was not the sound it was making. It was more like a box of rocks when you were idling down, and running at idle. When you throttled up the sound basically went away. The set ring that goes bad (breaks into a bunch of pieces) allows the alternator to "move" just a but thus creates the sound as it now has this play in it. My opinion is that this does not sound like the ADG, which be a good thing because if it IS the ADG you have to pull the engine. I would try the rebuild first.
Good luck with that idea. The rebuild shops I have been talking to will not split the case on an alternator they can not bench test. That is why I am looking for a bad ADG so I can make a drive to test gl1800 alternators. I have a local shop that says he can get the parts to rebuild our alternators with all new parts except the armature at a fraction of the cost of new but he will not do it unless he can bench test afterward.Okay, bearings going out. Pull it, take it a rebuild shop, reinstall.
I already have one of the 70amp ones off a 2004. I would have to change the armature and field windings to up it which not be cost effective. I could use one of the 90amp ones though. If I can get the ADG drive set up going. That would be the first one I would get rebuilt. I am going to get the 70amp one going anyway. You know where I can get a bad ADG?