and just a wild guess but ive been told before by seniors that a whining from the front can sometimes be hub assemblies..manly the bearing. just a thought

 

I would assume it would be a consistent noise if this was the case, but I could be wrong. I suspect its in the pinion bearing or a bad tc bearing at the ft driveshaft yoke given it changes with throttle. Oh well, I was hoping someone had experienced this issue, but that's ok. Been like this for almost a year now. Thankfully I don't use 4wd very often, so it hasn't gotten any worse so far.

 

Funny thing is off and on mine.makes a very hard to notice whine..its only when i let off the gas its so strange and only occurs like once a month