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horrorbiz 01-02-2013 04:47 PM

Possible Center Diff Issues on 11' WRX
So I am having a strange issue with my car and I am curious if any of you have any thoughts / suggestions.

When turning tightly at slow speeds (either direction) my front end / center are making a strange knocking sound, almost like a wheel hop... but this only happens after driving on the highway for at least 15-20 miles. If I were to leave the car over night and then attempt to recreate the sound / feeling the next morning it would not happen.

After doing some research I started to think it was a center diff issue. Being that my car only has 34k on it and I don't abuse it, it seems unlikely. This morning I had Dent Sport check it out. They drained the fluid and everything seemed fine, no chunks of metal or other signs that the diff was shot. They checked out axles/etc and everything seemed fine.

They did however discover that the engine/tranny moved quite a bit and that the exhaust may have been hitting the driveshaft (and there were marks to show that). Anyway, they replaced my transmission mount with a Group N and thought the problem was solved. By the time I got home the noise was back...

I have an appointment with Subaru tomorrow morning—though I am a bit apprehensive due to my car being modified a bit (suspension, stage 1+, etc).


pzr2874 01-03-2013 05:48 AM

What suspension pieces have you replaced?

Edit: found your intro thread.

Is it possible your RSB bushings are not lubed enough.... I'd start with that area. And the endlinks.

Vew 01-03-2013 10:48 AM

Is it possible your RSB bushings are not lubed enough.... I'd start with that area. And the endlinks.[/quote]

Knocking from RSB bushing usually only happens from bumps from my experience.

I have a similar knocking on my Outback the way you describe but it happens at any time I take a tight turn (slow speed). I just haven't cared to figure it out since it's a 13 year old car/beater.

Edit: It's probably your CV joint/axle. I didn't mention it earlier since I just replaced mine. Looks like it still happens with reman-ed axles which is what I replaced it with.


horrorbiz 01-03-2013 11:34 AM

I took it in to Subaru today. They are replacing the center diff under warranty. They even gave me a rental car!

pzr2874 01-03-2013 01:27 PM

Wow... nice.

horrorbiz 01-03-2013 05:49 PM

Subaru replaced the center diff... no more knocking/binding!

Vew 01-04-2013 08:40 AM

Glad to hear that was it and was fixed!

KD1CA 01-09-2013 07:59 AM


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