OK...Good News....it seems that it may have been the driveshaft afterall.
I decided to take it off the jackstands and go for a spin to see what I hear when things are tighter under load rather then free wheeling on stands. Sure enough..she runs smooth on the highway..no noise, no shudder, no grinding. Not sure why it sounds like its gonna blow up on the stands...but im not looking a gift horse in the mouth. Ill drive it for a few days and put a few miles on her and see how things go. If anything changes i'll post info for others to read.
Now to figure out why my starter slow cranking and is sparking to the block....but thats another thread for another day