Ok just to start off the truck is a 97 F-250 with a dana 60. It has manual locking hubs. Ball joints and u- joints were just replaced this summer. The wheel bearing are under year and half old, and were inspected before reinstall on the dana 60 from the dana 50. The problem is when the hubs are locked or in 4x4 with the hubs locked when driving and letting off the throttle there is a rubbing/ maybe light metal on metal sound from the front left side. I have put it up on jacks, wheels spin great and bearing feel fine. The lock outs are working great. Also is no play in joints when pulling on the wheel. I was wondering about the inner axle shaft. There is no play in from up and down or from front to back, however there is about 1/2 movement if you grab the joint and pull it towards the hub and push it back in. Could this be causing the noise. If so how do i fix it from moving back and forth. There is no noticeable noise when truck is under load, just when you let off of the throttle, hear more when you let off of the throttle from 20 + mph. Any ideas would be a great help.