I had a look under my 130 this arvo, and the position of the rear uni on the front tailshaft is quite a bit higher than the position of the radius-arm-to-chassis pivot point; I recall on the range rovers (I drove them for 18 years before getting the defender 12 months ago) I noticed that the pivot point of the propshaft and the radius arms were almost exactly in line. Perhaps the difference is part of what leads to these problems with the Defenders. The geometry is such that the tailshaft will extend somewhat as the springs extend, but the angle of the front uni joint will change very little. The angle of the rear uni joint of course changes dramatically with ride height, as the shaft is quite short.
