Whine noise while accelerating/cruising

[pegreen]

Hey guys, I'm bringing this thread back from the dead as I'm having a similar problem. The noise from mine is coming from the front and having just replaced my 2nd diff and a transfer case to try and solve it the noise is still there. The rear diff was making a noise but I replaced the oil and seal and there's nothing there anymore. Does anyone have any ideas?

I have the same problem in my 96 awd front end, did you replace with a used diff? Or change the pinion bearing?

 

[Merald]

Any conclusions from all of you after repairs? Have the same thing with whining sound in front when acceleraring on a 2001 ford explorer and trying to think where to start looking.