Steering boxes see tremendous loads, so be absolutely certain you know what you are doing if you plan on fabricating your own steering box mount. We’ve seen a lot of butch mounts over the years and they’re just plain dangerous. We’ve had the best luck drilling the frame and welding in heavy-wall DOM tubing with an ID that closely matches the mounting bolts (7⁄16-inch in most cases). Run the tubing through both sides of the frame directly to the box. Inevitably, one or more mounting bolts will be above or below the frame, so be sure they are heavily gusseted as shown.