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Old 12-10-2012, 07:24 AM   #1 (permalink)
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Default Differential or CV Joint

I have a standard 2.5L EJ25D 99 legacy outback. When I turn slowly and sharply my rear axle makes a clunking noise. As I make the turn it also "hops". Could it be a bad CV joint? I think it might be the differential but am wondering if anyone else experienced this. If it is the differential, does anyone know the final gear ratio for this model? Thanks
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Old 12-10-2012, 08:08 AM   #2 (permalink)
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Sounds a lot more like torque bind. Search for that term and you will find many threads with info and answers.
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Old 12-10-2012, 08:45 AM   #3 (permalink)
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The AWD transfer system might be malfunctioning. Search here for "torque bind". There's a good number of discussions.

If it's a manual transmission, then the cause could well be a failed AWD viscous coupler. If it's an automatic, there's several possibilities. In the MT case, the only real fix is to replace the center differential/coupler. In the AT case, there have been instances where multiple ATF changes have resolved the problem, but it might not and a replacement/rebuild of the transfer valving and/or clutch is needed.
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Old 12-10-2012, 10:12 AM   #4 (permalink)
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Please do not post identical threads in multiple forums, it really clutters things up.

I merged the 2 with responses and deleted the 3rd.
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Old 12-10-2012, 08:26 PM   #5 (permalink)
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Could it be a wheel bearing?
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Old 12-10-2012, 08:30 PM   #6 (permalink)
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Not likely.

Is your vehicle an auto? If so, how old is the ATF? Do all 4 tires match in wear and diameter?

Put a fuse in the FWD slot under the hood. Does the vehicle still behave the same way?
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Old 12-11-2012, 07:02 AM   #7 (permalink)
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Its a Manual. I am going to jack the car up today and push the wheel in and out to see if it is a wheel bearing. But like you said it is unlikely that it is the problem.
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Old 12-11-2012, 08:35 AM   #8 (permalink)
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any work, mods or wrecks before this began?

99 is old enough to possibly have drivetrain problems anywhere in the system including rear axles and u-joints, etc.
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Old 12-11-2012, 09:25 AM   #9 (permalink)
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Quote:
Originally Posted by newsub64 View Post
Its a Manual. I am going to jack the car up today and push the wheel in and out to see if it is a wheel bearing. But like you said it is unlikely that it is the problem.
While you have each wheel off the ground for that, take a moment to measure the circumference at center of tread with a tape or bit of wire. Compare the measurements.

WBs in subarus tend to announce themselves with low howling noises at speed. It's actually harder to find one by feeling for radial play, at least until they are way gone.
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Old 12-11-2012, 12:33 PM   #10 (permalink)
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Angry

This is the least of my worries now..... My clutch is starting to slip.......
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