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Karl, It's kind of hard without pictures, but what I think that you are talking about is the conflicting radii of the arms as they go through their travel. The lower control arms will cause the wheels to move in and out with suspension travel. The stock Jag trailing arms will try to pull the wheels fore and aft with travel. On paper this would create a suspension that would not move, the solution is found in the form of big rubber washers on the trailing arms that allows them to have some fore/aft give. The problem is that this fore/afm movement is just what the arms are there to prevent.
With the radius rod having both inner and outer pivot points alligned axially(I think that's a word...), you are effectively creating a big stable triangle. I've seen some Jag based rears where they have replaced the lower control arm with two rods with heim joints at each end, and the entire fore/aft load is carried by radius rods.
-Jon
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