John.
I had the same problem with an M38. After a wheel balance failed to cure it, I started checking everything from the steering knuckles inward and up to the steering box, replacing every suspect bearing, pin and tie rod end. The problem gradually improved as each suspect part disappeared from the system, but still showed up whenever I hit a serious pothole or bad railway crossing. At that point i noticed the front spring assemblies had a noticible lack if arch to them. put new springs, shackes and pins on the front end and problem finally solved. Never came back either.
As others said, it is an area where a number of smaller problems seem to add up and have a very alarming effect. Definitely an area where it pays to take your time sorting it out.
David
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