her's a pic of my YJ, 3" lift, and 33x12.5 tires on 15x8 wheels with 4" of back spacing.
I had the flares off for painting, and the edge of the tub lines up almost perfectly with the center of the tire.
Also, I get a little bit of rubbing on the front springs when the steering is turned all the way in either direction.
I could adjust the steering stops, but it's not that bad, so I just live with it.
you could go with less backspace to eliminate the rubbing, but that will also make the tires stick out even more.
anyway, here's a pic,