<VV> Speedometer problem on 63 Monza

[Charles McKinley]

The speedometer on my 63 Monza has had a problem ever since I got it  
in 1993, such that I've had to uncable it so that it doesn't work at  
all. Specifically, at speeds above about 40 mph, the drive cable  
screeches and the needle bounces between zero and the top peg. Before  
you suggest the obvious fixes, I've replaced the entire instrument  
cluster and tried several new drive cables (including a new cable  
housing), none of which helped. I have two speedometer movements, one  
in the car and one on the bench, and if I drive them externally (low- 
speed drill with a short cable), the movements work smoothly. I also  
discovered that if I loosen the collar on the end of the drive cable  
where it hooks up to the back of the speedometer unit, it works a  
little better, but still not as it should. This leads me to believe I  
might be missing some sort of a thrust washer between the end of the  
drive cable and the speedometer. Is there supposed to be such a thing?  
I don't have a complete shop manual that would show that level of  
detail. Or is it simply a case that the drive cable can't handle the  
~270 degrees of twist between the trans and the speedometer without  
jamming somewhere? I've lubed the heck out of it numerous times to no  
avail.
	The only good side of this is that the Monza hasn't registered any  
miles in 15 years!

Thanks for any advice,

Chuck McKinley