In this particular case it's an aftermarket shaft that I got second hand around the time I got this second hand transmission. Interestingly it didn't appear that the driveshaft shop did anything with the weights, no new ones and the old ones are still in place, but whatever they did got me sorted. Just glad I don't have to pull the transmission again.
In other news after putting the suspension through the Indiana road test, the rear end, at least by eye, is centered. Wish it was a bit lower. And those camber plates didn't provide very much camber at all. Hoping to run in the negative 2.5-3° range. So, I'll likely end up slotting the upper mounting hole on the struts.