Wheel hop? Tire rubbing sound slow left turn

[Co-MAAAN-cheee]

My 88 MJ has developed a symptom. It seems similar to what happens when you're turning on dry pavement in four-wheel drive, but it's not anywhere near back. I don't so much get a hopping as I can hear a tire scrape as if I'm kicking off too quick on gravel. I took it to a shop and they told me it was ball joints $2,000 later problems still exist. I carefully checked the front axle even removing the cad and locking the front axle in two-wheel drive. No change in the symptoms. It happens just as you're starting up in in a left-hand turn. From in the cab it sounds like it's coming from the front but gosh it's hard to tell. I have a couple of theories at the moment. One is something's wrong with the front suspension causing some toe out or there's some problem with the rear diff causing a slight bit of binding. 

 

Anyone deal with this exact issue or would you check next?

[89 MJ]

Does this happen at all speeds? 
If the tire is rubbing on something, you should see a bare metal wear mark or a black mark if it’s rubbing on something plastic. 

[Co-MAAAN-cheee]

I only notice it at very slow speed. Mostly just at take off. 

[89 MJ]

I would check the alignment with a tape measure quick to make sure the toe is close.