First the housing gets tubes pressed in, cools, and is checked for straightness. Then it gets the mounting brackets welded on and is checked again. Finally, it meets the assembled third member, brakes, and axleshafts for final assembly and double-checking of dimensions. Note the heavy-duty 1/4-inch-thick brackets that allowed us to bolt this axle in place of our stock one with no problem at all. All bolt holes lined up just fine.