Does anybody else's Bronco do this?

94 FS Bronco, front end is tight, wheel alignment must be OK, as tire wear is flat across, no pull or anything unusual.
Tires are the stock XLT size 265 75R15, as per the door sticker.

When backing up in a TIGHT turn on concrete pavement (in 2WD, and hubs are unlocked), the INSIDE edge of the front tire on the OUTSIDE of the turn, leaves a black rubber tire mark. Can see the edge of the mark clearly on the pavement, and the mark fades out across the tire width.

So, for example, if backing up with the wheel turned hard LEFT, the inside edge of the RIGHT front tire leaves a mark. And vice-versa, if backing while turning hard the other way.

Its always done this while I've had it, just didn't back up in that tight of a turn much before.

Interesting...I have a 93 and I've never really noticed that except one time when driving on a basketball court. I left all kinds of rubber on that thing, doing like 1 mph. I think I may have a limited slip rearend, because it's always felt kinda funny turning around corners. I can't really turn very sharp..something about the gearbox, but there does seem to be something strange about it all.

I've had 31" BFG's since I've owned mine. It sounds like your Ackerman angle is off a tad. There was a TSB for the radius arms with an improper caster split. Maybe you're one of the unlucky few. I'll post it if I can find it.