I replaced a few seals when the box was out of the car, and they are fine. The box is leaking from the huge nut on the input shaft side. The box feels good, no exessive wear or slop, so I preffer keeping the box over replacing it. I did find and article on rebuilding an older type box ,and that had an O-ring around the nut. Is that the same on e-body boxes? Can I take that nut off and replace the o-ring just like on the old boxes?