Thank you that's a very good answer! I hadn't thought about more drop on the opposite side causing the tire to go up further, the bump stop being the pivot point. Another thing I thought about was the tire size, I still think of a 31 as small, being a fullsize chevy guy. According to the window sticker my jeep came with 205x75x15 tires stock a 31 is more than 2" taller than the 205's so the suspension height change is smaller than the tire height change.
Off the top of my head a 31 should be around 4" taller than a 205... correct me if I'm wrong please. Granted a 4" taller tire only give your axle 2" more clearance but there is also 2" more on the top to rub the fenders right?