Rotational tap/pop sound from front end diagnosis help

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Badgertits

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Just noticed the other day while driving in 4a @ very slow speed, like just rolling forward at idle or slightly above a tapping/light knock type sound - initially I thought it was just the tire going over the reflective strips on shoulder of road or potentially even something lodged in the tire- very much felt like that & could feel it in steering wheel & hear it as well, SEEMS to only do it in 4a I switched back & forth last night & it seemed to only replicate in 4a but I may have heard it in 2 also

Also felt it in 4a when allowing the truck to just coast from like 65-70mph down to 45ish in between that Range made it as well but more faintly less noticeable - in every other way truck is functioning normal & there doesn’t appear to be any loss in function of 4a the front wheels were definitely engaging when they needed to & as indicated on the DIC power distribution, I am going to try & see if it does it in 4Hi or Lo today

There is no bad mechanical sound or feel when I’m driving it aggressively in 4A or even “normally” only noticed this at very light or no throttle & only at certain speeds
I am guessing a wheel bearing, IWE, axle/CV, or the transfer case all would come into question?
 
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