I have an04 EB Expedition.

Bought it used a couple months ago and thought the front end noise was the snow tires it came with.

Put the ford rums with BFG ATKO on and same noise.

Sort of a mild thump that roars louder as I drive and changes as I turn.

Is this a bearing/ hub issue? Or... What else can I do to determine?

Thx in advance

 

Yes, change both front hubs.

 

The assumption is that it's a 4wd. No mention in your profile, even though you mention snow.

 

Like alloro said, bearing hubs for sure, possibly the CV axles also. Check Rock Auto's listings for the parts.