2001 e350 steering

its my dads work van and its got the 5.4L its smoth at frist then get real hard to turn like ps isnt workin then gets smothe again its crazy he had the power steering box fixed like 50k ago maybe thats it again i dont know whats wrong he has a belt that over 112k old could that b it not sure thanks for takin the time to read this even more if u can help me out
:screwy: nick:banghead:

Hey, I have a 91 E350 with the same problem. It's been okay when making left turns but turning to the right you have to wrestle the wheel to make a turn. Today, I was on the highway and I went to change lanes and it was actually almost locked. I managed to get off the highway and to our destination, and took it to a garage and before I got there, it all of the sudden loosened right up, but the right side was still tight. Have you figured this out yet, if you find out more info, please post it here. I'd love to know. I'm taking mine to a garage tomorrow to check it out.