Howl from rear end after new control arms

[machine1515]

I have a 95 Gt Vert that has 65k miles on it. I am slowly upgrading items on it that need to be replaced anyways. I have already lowered it and put in steeda x2 ball joints and MM 4-post caster camber plates. IMy most recent upgrade was Blue Oval upper and lower control arms with polyurethane bushings and now I hear a howl from the rear end. The noise occurs at all speeds but increases in volume as speed increases. It still has the original gears.

Could this be a vibration that was always there but I could not hear because of the stock rubber bushings or did I change the angle of the rear end and something is not correct anymore? I measured the new control arms before I installed them and they seemed to be the same.

 

[94gt5.o]

Have you checked your U joints? and are the upper control arms adjustable?
Also make sure everything is good and tight.

 

[BlownFiveLiter]

Most likely the polyurethane bushings are transferring more NVH into the cabin.

 

[machine1515]

I was thinking either u-joints or a bearing somewhere. The control arms are non-adjustable and everything is tight and greased.

 

[Dino Dino Bambino]

Most likely the polyurethane bushings are transferring more NVH into the cabin.

Exactly.

 

[94gt5.o]

Ok then it is your bushings any time you stiffen the car with poly its less forgiving as far as comfort goes but it helps a ton with handling.