Ford 7.3L Power Stroke (1999-2003) :: Light Metal Rubbing Noise Coming From Front Left Wheel

I have developed a sounds that sounds like metal on metal. Not a grinding but more of a "swish swish swish" light metal rubbing when the truck has been running a mile or two. I can barely hear it over the radio but its very noticeable when the window is down. It is not affected by the pressing the brakes and it gets louder and faster in direct portion to speed. It will occasionally leave and start right back up. I touched the front rim around the hub and it was hotter than I wanted to hold onto. It didn't burn but it was hot. It was 105 degrees that day. Here is what I have done.

I replaced that front hub in 2010 and probably have 50K miles on it. I did the 3-9 test and there was no noticeable play. I spun the hub and while it seems to spin ok it does seem a little dry.... I will pull it tomorrow and see what it looks like.

I pulled the calipers off and the brakes pads are at half way and there is no burnt smell. I spun the rotor and it seemed flat and straight. I do have a small tiny lip all the way around them on both sides but I figured that's normal with 265K. I pulled the pins and they were dry but they didn't seem to be sticking. I cleaned them up with the boots and am going to replace them when I get some brake grease tomorrow. I have not looked real hard at the caliper but I plan on pressing that with a C-Clamp tomorrow to check it. Since the rotors and pads looked OK, I assumed there was not a stuck caliper although haven't ruled it out. The axle behind the hub seem to spin freely before I removed all this stuff and the hubs are not locked.

I think I covered it all .. I also thought it could be a rock or stick but nothing came out of my caliper or rotor when I took them off ..