No, it's not a 100% guarantee the IWE isn't the problem, but a noise like you describe seems to be pointing to a bearing IMO. It's not much more work to pull both and take a look. Everything is pretty easy to get to. The worse part for me when working on these things is sticking the tire/wheel back on, bloody things are heavy.
It's very important when you reassemble, that you align the teeth on the IWE. If not, when you tighten down the spindle nut, you can damage the IWE.
I suggest taking a look at videos by "Makuloco", he's a ford Tech that really puts out very good videos, that are correct, and covers the bases. He covers IWE and hub replacement. Just do a search for IWE replacement, and hub replacement, his videos should popup.

 

No, it's not a 100% guarantee the IWE isn't the problem, but a noise like you describe seems to be pointing to a bearing IMO. It's not much more work to pull both and take a look. Everything is pretty easy to get to. The worse part for me when working on these things is sticking the tire/wheel back on, bloody things are heavy.
It's very important when you reassemble, that you align the teeth on the IWE. If not, when you tighten down the spindle nut, you can damage the IWE.
I suggest taking a look at videos by "Makuloco", he's a ford Tech that really puts out very good videos, that are correct, and covers the bases. He covers IWE and hub replacement. Just do a search for IWE replacement, and hub replacement, his videos should popup.

 

Ok a little update. I drove 15 miles home on the interstate and felt both front hubs, no difference between the two and neither felt overly hot. I did a little experimenting on the way home and noticed that if I turn the wheel to the right the noise goes away a little. You would think this means the right wheel bearing, but I can 100% tell that the sound and vibration is coming from the left side of the truck. I've never dealt with tire cupping, but starting to wonder if my left tire has it because of the noise getting noticeable at deceleration? Would tire cupping also make noise as you accelerate?

 

Tire cupping would certainly make noise, accelerating and deaccelerating. I was under the impression for some reason that your tires were OK. Once a tire starts cupping, it's rare it can be saved.