One further thought, when you rebushed the suspension did you make sure the bolts were tightened up with the car sitting on its wheels. If you tighten with the suspension hanging you get all kinds of weird preloads on the bushes, which can cause judder as thy desperately try to get back to where they are supposed to be.

I like the propshaft out of phase idea, basically all the fixed eyes on the shaft should be in the same plane on both halves of the prop, one half of course is so per definition, he other should echo it. In practise therefore the prop can only be assembled in phase in two ways. Therefore if you have lost the original assembly position it must be one of two ways. In practice I have assembled several props out of diparate halves, with nary a judder yet.

Regards