The u-joints are OK; there is very little play in the drive train. I think Mike could be right about the prop shaft not being balanced. Since there is one non-standard not and bolt it would suggest that it has been interfered with and did they put it back the way it came off. I have no way of knowing. I might replace all the bolts at the gearbox end where the non-standard bolt is as a simple first measure.
I've never fully understood why the prop shaft should be fitted back the same way at the flanges either end. After all it is balanced off the car. The critical issue I would have thought is that the splines in the centre must go back the same way, as that is the way they are balanced off the car. So my worry is that someone has pulled the splines apart and put them back in a different slot.
Roy
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