I don't know much but I don't think it sounds so much like an axle.. With that said, I don't know for sure WTF it is but you might want to try getting your car up on a lift and get underneath it.. turn the wheel by and see if anything looks like it's rubbing or wobbling or anything.

I had a motormount that was severely loose after getting my car back from the shop.. it caused an awful noise and vibrating noise.