Tks Ed,

I dont see how the pinion could be out, it was OK before I did the transfer case swap.

I have tried it without the front shaft & its all good. Ive also tried it without the rear & it still gives the vibes.

I have sent all the info to Tom Wood for the angles etc. One of the things to come out of having the angles measured is that that because I had to clock the transfer case upwards a bit to clear the front torsion bar, that has got the front yoke pointing upwards at 5.5 deg. It then meets a downward pointing driveshaft of 3.4 degs, so that operating angle is 8.9 degrees.