Is the vibration present around 1600 RPM regardless of the speed? If so, I'd guess the longer shaft is putting a bind on the mounts and causing the transmission of more engine vibes to the chassis.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250