Many other threads going on motor mounts. I have fooled with alternatives from polyurethane-filled to tried Corvette hydraulic mounts, in my quest for a smooth drive. I hear these 5 cyl diesels were smooth from the factory, and hard to imagine they could have been sold as luxury cars otherwise. So far I have verified that the mounts make a big difference. I have settled on trying quality German mounts. The cheap Made in India ones (Anchor, etc) don't seem to work well or last, and poly-filling them makes them too stiff, at least w/ a backer support needed to make the poly work.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

I solved a great deal of my vibrations by changing out the motor mounts along with the tranny mount, the u joint mount, and the differential mount. Might be worth a check.

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-Typos courtesy of my mobile phone.