I have a leak that's coming from under the 5/8 nut on top of my steering box. It was rebuilt but has been leaking ever since. I looked in the service manual and saw that there should be a washer seal under the nut. I haven't removed nut to see if seal was there but did check for tightness and it's tight.

Has anyone here dealt with this before?

I placed tape on top to better see the fluid as it leaked out.

Thanks for the help.