Im posting this on behalf of my father who also has an Excursion 2000 V10 with 4x4. He has had his steering box replaced twice now and all of them leak. I put dye in and with a UV light they all seem to leak about the back???

Anybody have any tips on why this would be happening? He's tired of the oil slick on the driveway.

 

Leaking from the back? Gotta pic? I'm trying to visualize.

 

I'm trying to remember as well! If memory serves it was where steering shaft comes into the box itself. Box of the steering boxes that were installed were brand new. They were installed by a shop that does a very good job.