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I have a 95 subaru with 202K mj. When coming to a stop, I get a clunk from the back at about 10 mpg. It happens almost all the time whether braking from 50 or 20 mph. It sounds like a wrench sliding against a part of the metal frame, but of course it's not.

 

I'm thinking something about the rear differential or the knuckle joint. I just thought that this is so distinctive that someone would recognize it.

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Well I think that I mostly solved the problem. The rear differential was only 1/2 full. I added 12 oz to bring it up to the overflow [i couldn't get the drain plug out so that's the best that I could do].

 

I think that the rear differential was free wheeling and as I braked, it caused a thud when the knuckle reversed as the drive shaft stopped. The knuckle is a little loose and rotates about 3/8" as measured on the perifery when moved back and forth by hand. With the addition gear oil in the differential, it is damped and doesn't free wheel.

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The rear differential free wheels most of the time anyway since the majority of driving load is placed on the front axles and differential.

 

Play at the knuckle is likely a bad wheel bearing. If it has noticeable play the bearing is about to fail entirely and you will be left with a crooked wheel at the least. You need to investigate further and find the exact source of the play.

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