I really doubt this because the total suspension movement range is not changed and you still have stock sized tires. If this was true, then if the 4Runner was loaded with gear, the tires would rub...which doesn't make sense. With stock sized tires, the tires should never rub within the range of suspension articulation. The only thing that would change is that you would lose 1 inch of upward suspension travel, but gain that 1 inch on the downward suspension travel. The loss of upward suspension travel will make make you bottom out the suspension more. If you shorten the bump stops, THEN you have a chance of rubbing. Also you would need an alignment after the drop since the camber of the front would change.