>I can only describe it as a driveline vibration, which shook the entire
>vehicle. It seemed to be independent on things like whether the clutch was
>engaged or disengaged, and seemed to worsen the slower the vehicle went,
>with the most severe shaking occurring at less than 20 mph.

Adam,

Remove the driveshaft and try it. Probably needs new U-joint(s) and/or stub
axle bushing. Check the archives, particularly on the Syncro list.

Angus

================================
Angus Gordon                       '89 Carat
NW Ohio                            '86 Syncro