78 K5, rebuilt from front to back, new front springs.
"New" full posi rear diff.

13 y.o. 31x 10.5 tires worn to near the wear bars.

Toe was way out, it was set by tight string to rear wheels, helped a lot. Ball joints and tie rods etc tight.

Problem, its " pushing" badly when at 30 mph and large turn radius. Steering index jumps around at times in/ out of shallow slower corners. Doesnt do it at highway speeds in gentle curves.
.Cant find anything wrong in the front end, rear axle appears square.

Can the combination of a full posi diff and old worn tires with hard rubber do this?