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D2 - Transmission Gearboxes, diffs, drive shafts.

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Old 25th May 2021, 12:43 PM
tonyt102's Avatar
tonyt102 tonyt102 is offline
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Default Output shaft leak

Hi all.

I’ve had the common gearbox output shaft leak on to the cat. I had the seal replaced by a local trusted garage and it still appears to be leaking. There’s a couple of great sticky’s about this issue and I can see there are 2 seals, one for the updated flange and one for the oe version.

If an updated seal was fitted to an old/original flange, would it possibly leak? What was actually updated on the flange?

Thanks in advance.
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1999 Audi S8 D2 ::
2007 Audi A8 D3 Quattro Sport 3.0 TDI :: Quartz Grey
2002 Audi S8 D2 Final Edition :: Aqua Blue :: Sold
1999 Audi S8 D2 :: Sold
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Old 25th May 2021, 09:08 PM
MikkiJayne MikkiJayne is offline
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The updated seal has an extra lip on it which makes no discernible difference to anything, other than it won't fit with the original flange.

Original flange: needs the original seal
Updated flange: works with either seal

Was it all cleaned up properly? Could it be residual oil still dripping or is the new seal definitely leaking?

The front output flanges can also leak, and while in motion the oil can fly backward and catch the exhaust and cats, although its rare they leak this much.
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Old 28th May 2021, 08:44 AM
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tonyt102 tonyt102 is offline
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Thanks for the reply.

Would the revised seal even fit the old flange or vice versa? Or is it impossible to get them the wrong way around?

Thanks again.
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1999 Audi S8 D2 ::
2007 Audi A8 D3 Quattro Sport 3.0 TDI :: Quartz Grey
2002 Audi S8 D2 Final Edition :: Aqua Blue :: Sold
1999 Audi S8 D2 :: Sold
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