re. 4KSQ does not handle like an all wheel drive!!!Help

[Swann, Benjamin R. (BSWANN)]

This sounds like an alignment problem - the slightest amount of toe out in
the rear, and the car will act like its got a mind of its own.  

I had a similar problem that you will want to rule out - one of the rear
ball joints had completey disintegrated.  Can't believe i was driving around
on this.  My attempts to id the problem by jacking the car and wiggleing the
wheels did not reveal the problem, but the forces generated while driving
do.  It would also start to "oscillate" with rear end swinging back and
forth precariously at higher speed when going around a modest corner.  Talk
about an adrenalin rush! It finally got so bad that you could visually tell
the ball joint was bad, but up to that point, several mechanics who looked
at the car didn't see the problem.

[From: "Muhammad Sohaib Bukhari" <xsohaib at hotmail.com>
Now the SCARY PART, when I drive it straight it drives like an 
18 wheeler, the back end of the car has its own mind, can't get past 25 mph 
otherwise it goes totally out of control, and I am afraid it will hit 
something. The situation gets worst of I UNLOCK the differentials. No matter

how much I try to keep the front wheels straight the back end keeps swinging

to the left and right continously regardless of speed.In fact a couple of 
times it started to go side ways when I tried to go over 30 mph on the 
freeway thank GOD(realle one) there were no cars besides me.   It is very 
scary! ]

This really does sound like the ball joint problem - check it out
thouroughly rear tie rod ends and lower ball joints - something is loose.
This will cause you to lose control, particularly when you need it most.
Once you find and fix, the car will handle steady as a rock as you expect.

Regards,

Ben
'85 4KQ