The stock box is doing fine on the pavement but I haven't really wheeled it yet with the 38's. With the 35's and the detroit locker in front it would sometimes lock the steering until I let off the gas to free up the front. I expect that issue to get worse with the 38's. I made my own pitman arm using 3/4" steel plate, drilled a hole then welded the splined section which I cut out of the stock pitman arm into the hole. I drilled and tapped the other end of the arm for a 3/4" grade 8 bolt and used a 3/4'" heim joint. I really don't want to do that again if I don't have to. It would really be nice if someone had info on where to tap into the Mitsu box for hyrdo assist, anyone?