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xc90 D5 manual 2003 rear diff noise ?

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Old Jan 17th, 2018, 22:30   #1
MissSpentYouth
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Default xc90 D5 manual 2003 rear diff noise ?

Hi, I have a 2003 xc90 D5 manual with 145K on the clock.

I am getting a wheel bearing type noise from the rear wondering if it is the diff but cant be sure.

Rear tyres are worn but not choppy or miss shapen

Had it on the ramp running in 5th with all wheels spinning and listened to the hubs with a stethoscope and wheel bearings all seem fine.

Also listened to the diff which did seem noisy but no worse than the front one.

Noise doesn't seem to change when cornering, it is a bit intermittent and seems to vary with road surface

Thinking I might try it with a different pair of wheels on the back, also might disconnect the prop front and rear and try that.

If it is the diff I assume that the noise would change between under load, coasting and slowing under engine braking ?

Cant say it is that common rear diffs wearing out on these ?

thoughts welcome
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Old Jan 17th, 2018, 22:35   #2
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With the rear diff effectively isolated from the drive by the haldex unit would you expect the noise to change between accelerating, coasting or engine braking as surely this makes no odds to the diff as it is simply being turned by the rear road wheels with no drive from the prop under normal road conditions ?

I did have a faulty diff on a 2008 v70 T6 disconnecting the prop front and rear stopped the noise on that one. I then had the diff reconditioned and it was fine after that.

Are the diffs the same manual and auto if I were to buy one from eBay ?

Last edited by MissSpentYouth; Jan 17th, 2018 at 22:40.
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Old Jan 22nd, 2018, 23:06   #3
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Looking at sourcing a second hand replacement are the manual and auto diffs the same on the back ?
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Old Jan 23rd, 2018, 00:27   #4
gmonag
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Try swapping the wheels around. I had a whine that sounded just like a diff - and the stealer offered to swap it for £2000. It turned out to be tyre road noise.
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