Extreme Road Noise.....O.T.

My mother has a 2006 Subaru Outback. About 12000 miles ago we put new tires on it and began to notice road noise. It has progressively got louder to its current state. You seriously need ear muffs/plugs to drive the vehicle at 40 mph. So yesterday we borrowed my brothers car which is a 2008 forester. It conveniently had the same wheel and bolt pattern. We switched tires and wheels between the two vehicles to see if the noise was transferred to my brothers vehicle. To our surprise my brothers vehicle stayed quiet as ever and my mothers car is still unbelievably loud.

When her car was up on jack stands we spun the tires and noticed no considerable drag, grind, growl, or sound. The tires are at their correct pressure. None of the universal joints have grease fittings. The rear end has the correct amount of fluid. The vehicle has been maintenanced to all manufacturer specifications.

The vehicle has around 32,000 miles, has never been through mud or a field. It has never been in an accident which would cause an out of alignment situation.

What are your thoughts? Thanks as always.
 
There is a old story from my younger days about a front wheel bearing causing problems like this.
Just for what its worth, Kenny
 
I would lean more towards rumble. Definitely not metallic. It doesn't sound like wind noise because its a smooth and consistent noise.
 
I would be looking at wheel bearings, U-joints or something like that. As you are finding, it doesn't get better with time and at some point it will get bad enough that you will easily find the cause.

With 36K on the clock I would be talking to the dealer.
 
No noise sitting there idling or with a reved engine....front wheel drive....front wheel bearings.

Are they a hub assembly? Go to a shop, he will detach all the hardware, strut, tie rods, etc and press the assy out of the steering knuckle. Sounds easy but it aint.
 
I would check the front wheel bearing assemblies. I have had two in the last year that felt good by hand but made road noise. One was on a Olds 98 and the other was on a Saturn Vue. The Vue sounded like driving on a gravel road. Did the wheels get over tightened when the tires where changes???? That can cause rotor and wheel bearing problems. Many impact idiots out there.
 
I bought a new set of tires because I would've sworn they were the source of the noise. It was ready for new tires and an alignment as the tires had worn edges on the tread that I figured were the source of the noise. Didn't go one MILE and the noise was still there. It was a worn out front wheel bearing/hub assembly. Couldn't tell it until the tire was off and you could just barely move the stub axle up and down. '96 Taurus, but the Subaru is set up the same. Those huge bearings can last over a thousand miles making noise, not like the greasable bearings of my youth.
 
While your driving down the road, lightly swerve back and forth....does the sound change, possibly even disappear when you swerve a certain way? If so, I can almost guarantee you it's a front wheel bearing. This diagnosis has been correct on my vehicles 100% of the time so far.
 

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