07 Overland Whine/Howl under acceleration
I have a 2007 Overland with the Hemi and QD-II, and 155k miles. When I am accelerating, I get a really loud, resonating whining/howling sound between around 40 and 48 MPH. Above that it goes away, it is not being covered up by other road noise. It starts very abruptly at 40, it does not build up to becoming audible. It sounds like it is coming from the middle of the car, but it resonates so bad it is hard to tell.
It has been doing this for at least 15k miles and has not gotten any worse. From what I have read it could be the bearings in the rear, or the gears. I have also read that it could be the front driveshaft.
The local garage that does a lot of 4x4 work has a jeep specialist that will look at it for a few hundred, but I'm wondering it I should take the chance and rebuild the joint on the front driveshaft with the Dorman kit? It's about $80 on Amazon and I'm sure I could do the work, but I don't want to waste $80 and my time if there is not much of a chance.
Any other tips or ideas before I bite the bullet and pay to have it diagnosed?