In order to get the JK box on the TJ frame we had to hack off the heavy cast steel track bar bracket and flatten this area of the frame. We welded in a piece of plate and sleeved the four-mounting bolt holes with some thick-wall tubing. Here you can see the flat plate and sleeves we installed along with strap steel to strengthen the framerail in the area that we hacked up. JK boxes also have a bad rap for breaking sector shafts. That may be true on a 7,000lb, 37-inch-tire Unlimited with a big lift and a dropped pitman arm. We bet it will work fine on our relatively small tire’d 3,500-4,000lb TJ, even if we end up running 35s someday.