Used 4wd after not using it for a long time, now I have vibes!

So we've had a bit up snow up in the Pacific Northwest lately. I've used 4h on & off over the past few days. Thing is, I've haven't used 4wd in a loooong time (I know, I'm a dummy for not throwing her into 4 once in awhile). I took the truck out today (in 2wd) & noticed a humming/vibe coming from the the front drivers' side area that is most noticeable when decelerating around 40-20mph. Maybe it's there at other speeds but the engine/road noise might be drowning it out. I'm not sure. Any ideas? Is it the dreaded needle bearing? Can just using 4h after a long hiatus cause needle bearing failure? FYI, my truck is not lifted.

 

Does it go away when you go back to 2wd?

 

I was in 2wd when I noticed it today.