4kq front end binding

[vrona@ix.netcom.com (Steven Verona )]

Hello,

I have an 86 4kq that ha a strange binding in the front end (I think). 
The best way to describe the problem is the feeling of a tight rubber 
bushing around a metal rod and you try and twist the rod and it resists 
until it finally breaks free and makes a "pop" noise.  Then it starts 
all over again.  It is quite loud when driving very slow <5mph and can 
be felt whenever the car is running at a steady spead.  Under 
aceleration or deceleration, the feeling goes away.

Does anyone have any idea?

BTW, both diffs are open.

Steve Verona
86 4kq