I have heard of a number of cases similar to this with a variety of Landrovers - and in nearly all cases the answer has been swivel pin preload.
Mind you, one that wasn't was about forty-five years ago - turned out one of the front wheels was 26oz (nearly 1kg) out of balance - and it nearly disappeared when the swivels were set up properly.
If everything else is spot on you can sometimes get away with no preload, but then a very minor change is made, such as your new tie rod, and it starts wobbling. As someone said, the upper swivel bearing is a fibre bush that does wear, and from time to time you need to adjust it.
The later Defenders and Disco 2s I believe have roller bearings top and bottom - I don't know how they manage to avoid the need for damping at the swivels, probably rely more on the damper, possibly rely on friction from the seal.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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