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Guest Message by DevFuse

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2000 outback(auto) 97,000 ...differential noise.

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3 replies to this topic

#1 logic23


    Subaru Fanatic!

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  • columbus

Posted 27 March 2010 - 11:57 AM

This is how the story starts. My friend called me and said he was hearing a clicking noise from the front of car sometimes on acceleration. I told him it might be the CV joints but it was weird that they were making the clicking noise going in a straight line vs turning. I told him to bring it in over the weekend and we could swap out known good ones to see if it fixed the problem. Yesterday he called me and said that he was accelerating from a stop and he heard a loud pop and then a subsequent thunk-thunk. I thought the cv joint might have broken and he was hearing the shaft bounce around. The car is now in my shop all four wheels up in the air. The symptoms are: LOUD thunk about every 1/2 rotation of front. Feels like something binding up. I unhooked the front cv joints ( which looked/and felt ok) and put the car in drive/reverse and the noise is still there.:( My gut reaction is a bad front diff. I am going to drain gear oil to see if there are metal shavings etc. Anyone seen this? Are these front diffs known for failure? Thanks, Craig

#2 Gloyale


    It's a sickness

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Posted 27 March 2010 - 12:38 PM

it's not common, but it can happen.

I'm in the process of rebuilding the front diff on an 03 H6 Outback right now.

for a 4cyl model you may find it more economical to source a used trans.

this rebuild cost $700 plus in seals, bearings, and ring/pinion set (ring/pinion is $350 alone)

#3 GeneralDisorder


    Elite Master of the Subaru

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Posted 27 March 2010 - 12:46 PM

Not at all common - I wouldn't even consider rebuilding it with used transmissions being likely cheaper than just the ring/pinion set.


#4 Fairtax4me



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  • Charlottesburg, VA

Posted 27 March 2010 - 09:32 PM

Broken tooth on the ring gear maybe. Every half rotation would make it two teeth though. One on either side of the ring gear. It happens.

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