Join Date: Jun 2005
Location: I would rather not say
Re: Alfa GT Strange Vibration
Most likely: Classic buckled wheel or lost balancing weight on wheel. Try getting all four wheels balanced - worst to back (and four wheel tracking while you are at it).
Could also be an unevenly worn tire (Goodyear Eagles seem to be prone to doing this). Check the tracking/replace the tire on that axle.
Otherwise, could be front wishbones (upper or lower). Or even the driveshaft.