4kcsq Drivetrain Vibration

[MTNBykah at aol.com]

This one has me stumped.  I have a very noticeable vibration in the wheel at 
55-60 mph.  If I let go of the wheel it visibly moves bump-bump-bump-bump 
about 2 per second.  Then the vibration disappears and at 70-75 mph it has 
moved so I can feel it in the seat.  I get the same result with both sets of 
wheels / tires.

Most recent work was front tie rod ends, strut bearings, right ball joint 
(totally cooked) and 4 wheel alignment.  Before that was clutch and repacked 
outer cv's up front.  The car has about 160k on it, H&R springs and Boge 
Turbo Gas struts, and the suspension was completely rebuilt within the last 2 
years.

My best guess right now is to try swapping out the right front axle shaft.  
Then maybe a rebuilt driveshaft, just because it's never been done.

Anyone have any other ideas?

Thanks,
-Dan 
Possibly in the market for another clean low mile 4kcsq