Help with unusual sound only when freezing

[newjeepr]

I have a weird almost moan coming from my 1997 328ic whenever outside temperatures dip. When going slow, it sounds like a clicking and as I go faster, it turns into a moan.

It is definitely speed related and seems to have nothing to do with the engine. I can feel it in the gear shift (I have an automatic), and it does not go away when I put the car in neutral (while rolling). Braking doesn't seem to affect it (aside from the speed of clicking changing), so I guess it's not the brakes.

It goes away after 5 - 10 minutes of driving (warmed up I'm assuming?). I only notice it while cold and the ambient temperature is cold. I never notice when it's 50 degrees out.

I'm just looking for any ideas as to things to look at.

[Jeron]

The only things that it could be based on your description, is the Tranny, center support bearing, the differential or a wheel bearing.

You may be able to isolate the Tranny and center support by running it, in the cold, with the car off the ground.

I doubt it is the wheel bearing based on your description.

My guess is it is the tranny. I would replace the tranny fliud with the proper type, probably ATF, as my first step.