So I got it reinstalled and have been driving it for a bit. The grinding, ratlling dry bearing noise i was hearing is gone. The very high pitched gear whine at 45+ is not gone, but better and I guess tolerable for now. However I've got 2 new (or at least newly noticed) issues. A bad vibration at 50+ mph. I think I've got this isolated to the slip yoke in the rear driveshaft and or a balance issue. There is noticeable deflection in the slip yoke. I took that shaft back off and drove it in front wheel drive only and 90% of that vibration is gone. There is also a rather loud "clunk" when I let out the clutch, or load/unload the drivetrain at speed. Obviously it's not the rear end as it currently is unhooked. I'm wondering if this has something to do with the slop I noticed in the idler shaft and gears. I don't really understand how all that works or what happens when things engage and disengage. Any ideas?