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Old 12-03-2008, 10:44 AM   #1 (permalink)
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Unhappy rear end noise

Anyone ever have a clunking from the rear end under the car? Its only when I start driving and then goes away. I just got it looked at and the mechanic thinks i has to do with a drive shaft bearing. Has anyone ever had this problem or had to replace this part? The car is a '04 Outback. I am hoping it isnt the transfer case. Please comment with any info. Thanks.
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Old 12-03-2008, 11:07 AM   #2 (permalink)
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Yes! I have what sounds like the same thing. About 10-15 feet after I start driving there is a clunk noise then it doesn't happen again. I have no idea what the problem is but I'd definitely love to know if anyone has ideas. I've got an 05 OB 4EAT
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Old 12-03-2008, 12:08 PM   #3 (permalink)
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A few things:

Do all your tires match?
Are they all proerly inflated?
If automatics, when was the last time the tranny was flushed?
Broken sway bar?
Bad rear suspension bushing?
Bad Universal joint?
Low lubricant in the rear diff?
Missing exhaust hanger?

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Old 12-03-2008, 12:32 PM   #4 (permalink)
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Quote:
Originally posted by nipper

Do all your tires match?
Are they all proerly inflated?
If automatics, when was the last time the tranny was flushed?
Broken sway bar?
Bad rear suspension bushing?
Bad Universal joint?
Low lubricant in the rear diff?
Missing exhaust hanger?
At least for me:

Tires are brand new TTs, inflation's good (this issue has been pre/post tire install). Yes on the AT, fluid flushed approx 2,000 mi ago. Sway bar looks good on inspection, end links look pretty worn, but not sure if they are damaged or not (not really sure how to tell). Exhaust hangers are good.

Not sure about the suspension bushing, U-joint, or diff lubricant. I'm not sure how to check these things. At 88,000mi should I flush the diffs? Would this be a good starting point to diagnosing the problem?

What is so confusing to me is the noise only happens once when the car first starts moving.
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Old 12-03-2008, 12:35 PM   #5 (permalink)
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I should have mentioned loose brake pads, stuck or loose caliper.

It haoppens when it first starts moving because parts are cold, and the vehical is chainging direction (stopped is a direction).

Yes you could be due for a fluid change, but when was the last time someone checked your rear brakes?
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Old 12-03-2008, 12:50 PM   #6 (permalink)
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Right now the mechanic is saying possibly axle bearing. I am also getting my brakes fixed in the rear so hopefully it was the breaks (they were metal to metal). I am going to drive it a little longr and see if it gets worse. How long has it been happening to anyone? Mine just started yesterday. I have 99000miles on the car
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Old 12-03-2008, 12:56 PM   #7 (permalink)
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Quote:
Originally posted by JMM2525
Right now the mechanic is saying possibly axle bearing. I am also getting my brakes fixed in the rear so hopefully it was the breaks (they were metal to metal). I am going to drive it a little longr and see if it gets worse. How long has it been happening to anyone? Mine just started yesterday. I have 99000miles on the car
Sounds like your shop is on top of it.

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Old 12-03-2008, 01:02 PM   #8 (permalink)
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Quote:
Originally posted by nipper
I should have mentioned loose brake pads, stuck or loose caliper.

It haoppens when it first starts moving because parts are cold, and the vehical is chainging direction (stopped is a direction).

Yes you could be due for a fluid change, but when was the last time someone checked your rear brakes?
I recently flushed my brake fluid so I was working with both front and rears. Recently replaced front pads and rotors, back pads looked good. I'll double check the rear brakes for loose caliper or pad tonight.

If the change of direction were causing it wouldn't you think it would happen at starts/stops while the car is still cold too?

Does any one have a DIY guide for diff flush? Is this a DIY job for someone with a moderate level of mech. skill?
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Old 12-03-2008, 01:09 PM   #9 (permalink)
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Quote:
Originally posted by T_D_


If the change of direction were causing it wouldn't you think it would happen at starts/stops while the car is still cold too?
Nope as the drivetrain is always laoded up (where the slack is taken up) untill the car changes direction (fwd to reverse).

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Old 12-03-2008, 01:43 PM   #10 (permalink)
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Quote:
Originally posted by T_D_


Does any one have a DIY guide for diff flush? Is this a DIY job for someone with a moderate level of mech. skill?
To anyone else interested...

2005-2007 Outback Standard Maintence
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