truckernix nailed it. Check your drag link, it must be at or near level. It probably isn't anymore. There are a number of things you can do to fix it, shortening the pitman arm a little is a good first step. You can also raise the steering box up using a steel plate for a bracket (you can see pics of how I did mine in my dropped axle folder) or you can flip the drag link, or heat and bend the steering arm down.
Check the online shop manual for the procedure to check and adjust your steering box.
