Nothing felt in the shifter or steering wheel. Nothing changes when it happens with the shifter in D or in neutral. Speed is the only factor - nothing up to about 25, then it builds, from 30-40 it is the most, then by over 45, it smooths perfectly, no noise, no rumbling.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)