Tire cupping

Could be simply the tire.
Sometimes you get a tire with a bad belt inside or some sort of defect.

Seems like you did your due diligence.

Air pressure can play a key role also.
I tend to run max inflation pressure in my steers for best wear
Also some trucks are fussy. Don't run cheap tires on steer.

Stick to Michelin, Bridgestone or Yokohama.
Stay away from China stuff especially on the steer axle

 

What brand of tire was it?

 

A bad shock?

 

Replace the shocks.

 

I have Sailun chinese steers. They came with the 18 year old truck that I bought. Not sure how long they'd been run before I got it, but I know I've put 10K on them and have had no problems.

I hit a PA pothole this morning so hard that I was sure that I broke the steer axle in half. Not a mark on the tire.

 

If you guys read his post he said he replaced the shocks......

My money is on crap tires.

 

We ran Michelin on our old set back axle Volvo and it would cup the driver steer tire. We tried alignment,shocks,etc. with no success. We went to Bridgestone and it fixed it. Like swaan said sometimes it just takes a different brand tire.

 

Once the tire is cupped, that is it. It's now junk. It will forever roll out of round and out of balance no matter what parts you put on it. Rubber doesn't grow back once it's gone. So either replace it, or run it for as long as it is safe and tolerable. I recommend yearly alignments, quality name brand tires and always keep the inflation pressure at the rated spec of the tire.

 

Have you replaced the tire after you did all that work to the suspension? Sometimes once a tire gets a bad wear pattern nothing will stop it from continuing to wear that way because now the tire is the problem.