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There are a couple of threads around on this subject, but I had the same thing in my 81 300sd. It was a violent shudder that would develop into almost a pounding if you kept going. I think the general concensus on the cause was general looseness in the front end, namely the lower control arm bushing, and the track rod mount. I replaced my wheel bearings, shocks, and tie rods since then, and the shudder only comes back on certain road surfaces, so it'll take a full rebuild to get rid of it totally.
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