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Help., Howling 5KTQ

I have an 86 5KTQ that has started howling.  Kinda like a 60+ MPH wind 
through an open sunroof.  During routine maintenance, mechanic thought 
front diff.  But as fluids are good and recent, I'm Not so sure.  The 
noise is road speed sensitive gaining crescendo from slow to fast, but 
can go from volume to none and back again at same speed.  It is not 
direction specific like a wheel bearing, and center carrier bearing 
seems fine.  First heard it months ago as momentary noises, but has 
become almost constant.
Any ideas or BTDT'd helpful.

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