About 3 months ago I started having a grinding sound from the front driver side hub area. I replaced it and it fixed the problem. I read where you should do both because he other one is soon behind it but I waited. Now I started hearing it from the passenger side too. So I replaced it today and all was good until I tested it from 4 wheel back to 2 wheel. Once I went back to 2 wheel the clicking that sounds like bearings going out to me, was back. Anyone have these issues? What is it? Thanks

 

your 4 x 4 is vacuum operated and is located at each wheel ... read this about cleaning and checking componenets.

https://www.ford-trucks.com/forums/8...then-some.html