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      07-28-2014, 09:45 PM   #22
Lieutenant Colonel

Drives: 08 E90 335xi TiAg
Join Date: Dec 2012
Location: Sacramento, CA

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Originally Posted by E36graduate View Post
Here is what I would do as I went through this about 30,000 miles ago thinking the worse that my front differential was toast......but it wasn't.

I ended up changing both front wheel bearings...funny thing is the side I thought was making the noise was actually the opposite side. I originally thought it was the drivers side front bearing as that is where the noise seemed to be coming.

Then I thought it may be the front differential as it is on the drivers side and looked to be leaking. Put in fresh oil, thicker and noise still there.....then panic set in as there were only 2 used front diffs in the country, or spend $2000 on a new one.

Finally, my neighbor got my car up on his lift and we determined the front passenger wheel bearing was making some noise, but that didn't cure the problem........ended up finding the fron KW V1 struts were shot on the drivers side....absolutely toast.

Put new struts on and the Humming noise went away! Must be the struts dampen the noises from the wheels and road...basically with a blown strut I had all the vibrations and noises go from the wheel right up through the steering wheel.

I know this is old...but this post is exactly what I'm dealing with right now. I did every single thing you've done except put it on a lift.

I pulled the front drive shaft and think the noise is the output shaft on the front diff as it has some rotational slop. However...the noise started the day I put my used KW V3's on. I will be pissed off like a mother trucker if one of the struts is blown. Arghhhh!