Re: '71 Squareback front end

[Theo Thepen <thepen@pi.net>]

Hi,
I had exactly the same problem with a 63 notchback. The vibration 
occurred at about 50 miles and stopped around 60. It also depended 
on the road surface, smooth bitumen gave less problems than brick 
roads. Often a 'bump' would start the vibration. After checking 
everything mentioned by the others, and replacing the steering damper 
helped a bit, it turned out to be the balljoints. These were simply worn 
and had too much play. You could hardly feel any play at the steering 
wheel either when driving or standing still. The speed at which the 
shimmying or vibration occurs probably relates to wear or adjustment of 
other components. Out of ballance wheels in my experience cause a 
similar vibration but not just at one speed interval but at several.
Cheers,
Theo