Play/Slack in Steering

ScottG wrote:

Ductape wrote:
It would be a mistake to begin with adjustments to the gearbox before even checking front end and steering parts for wear.

I don't want this to sound wrong, but if you need a picture it's best to pay a good chassis shop to do this work.

Has the alignment been checked? That can cause wandering as well.

Add on devices won't fix this, just mask it.

Very true. no adjustment will cure suspension play or allignment issues.
Also, adjusting the box on the vehicle by tightening the screw down is very wrong and can lead to major destruction of the gear. If you do try this route then turn the wheels to one side and then make the adjustment. By design, the box has more play in the center than at lock. So if you tighten it too much at center it will bind at sharper turns and tear it up.