51 chevy truck rear 4 bar problen

[slick rat]

1951 chevy truck right rear tire shows bad center wear after 30 miles on new tires could the 4 bar be off center the left rear tire looks good.has anybody had this problen or my be able to help thanks

 

[R Pope]

What do you mean by center wear, is a band around the center of the tread worn down? That's usually overinflation. Can't imagine what would be misaligned to do that, especially to just one tire.

 

[Gastrick]

It could be off, but if one side is maladjusted, that makes both sides off. I tend to doubt that an incorrectly adjusted 4-bar could just cause the center of the tire to wear unless the tire is over inflated. 30 miles is a fairly short distance to start wearing rear tires, especially rear tires. Are you sure that the axle housing ends are welded on squarely?
The 4 bar adjustment is the easiest place to start and it wouldn't hurt to double check it anyway.

 

[Unkl Ian]

Open diff ?
The right rear spins easiest.

Wearing the center is usually too much pressure,or the rim is too narrow.
Or both.