Rick,

Several years back I encountered exactly the same symptoms and eventually
traced it to my right front outer CV joint. I would strongly suspect a CV
joint in your case. The bad news is that it will act up more and more
frequently as it wears. The good news is that the vibration stops when the
joint fails and you spread a trail of ball bearings all over the road!

Angus

'86 Syncro
'89 Carat

> I'm driving my syncro westie straight down the interstate cruising at
> 65 mph, suddenly the steering wheel begins to shimmy dramatically,
> violent enough that I'm looking for the shoulder fast.