AWD icy roads question

[Dino]

This weekend I was driving my Outback ('05 MT) on somewhat icy freeway roads
with a really strong sidewind. Over 50mph the steering wheel wanted to do
this slight oscillating motion left and right, which caused the car to start
to sway left and right. It was a little unnerving, but would go away if I
lowered my speed. I was wondering what the heck was going on. Possibly
some limited-slip action going on in the rear-end? Meanwhile other Subarus
zipped by me. When the roads dried out it stopped. Any ideas on what was
going on? I can't discount that maybe I was overcorrecting on the wheel with
the wind and all, but try as I might to hold the wheel steady it kept
happening.

 

[sewiv]

This weekend I was driving my Outback ('05 MT) on somewhat icy freeway roads
with a really strong sidewind. Over 50mph the steering wheel wanted to do
this slight oscillating motion left and right, which caused the car to start
to sway left and right. It was a little unnerving, but would go away if I
lowered my speed. I was wondering what the heck was going on. Possibly
some limited-slip action going on in the rear-end? Meanwhile other Subarus
zipped by me. When the roads dried out it stopped. Any ideas on what was
going on? I can't discount that maybe I was overcorrecting on the wheel with
the wind and all, but try as I might to hold the wheel steady it kept
happening.

First answer to just about any "my steering wheel did X" question:
Check your
tire pressure and make sure your wheel lugs are properly torqued.

 

[Marc and Jill]

Also, do the brakes pulsate @ all? when slightly applied, again steering
shimmy. Are the wheels balanced?