Noise from underneath

[F350Bigfoot]

When driving at about 15 to 35 mph there is a whining noise from underneath when you are accelerating. when you let off the throttle it goes away. I have checked everything underneath and cant see anything loose. Its a 2000 F30 4x4 Auto.
Thanks for all the help.

[F350Bigfoot]

Anyone have any clue?

[Nightcrawler]

Hi,
Can't you get a rough idea of where abouts it's coming from?
Hows your trans working?

[F350Bigfoot]

The trans is shifting fine. I have pulled the wheels off and pulled and tugged everything on the front axle. Checked the front driveshaft u-joints. I have grabbed, pulled and pushed everything that I could see. Its just when you accelerate from 15 to 40 mph. Its really getting annoying driving down the road and having to listed to it. Could it be the bearings inside the axle? I am absolutely lost.

[Nightcrawler]

might sound silly, but maybe try shifting gear manually. Drive slow & change gear when you hear the noise. I cant help thinking your porblem is related to the trans. If it was a wheel bearing it would do it all the time I would of thought. My front bearings made no noise at all when they were very worn out, but you could grab the top & bottom of the wheel when jacked off the ground & move it a hell of a lot.