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996 Turbo Gearbox/differential leak?


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  • 2 weeks later...

....and it’s not the axle seal after all. Turns out it’s the dreaded gear selector seal. Gearbox has to come out. Not great news. Now researching rebuilds as second gear synchro is a bit weak. Makes sense to get it done whilst box is out.


The mechanic had the car up on a lift and showed me some play in the gear selector mechanism. There was a drip of oil there, which I questioned if it was from the axle seal or slave cylinder. He stated it couldn’t be the slave as this will leak down the other side of the box. This is not always the case though, as seen in jpflip’s image above. He was adamant it was from the selector seal. Looking back at this my first image does suggest it could be from the selector seal. However, the oil leak is spread all across the gearbox around the axle, as seen in first pic, so im still wondering it’s leaking from above in the location of the slave cylinder. Now confused as I don’t want to go through the expense of a gearbox removal as second gear is only slightly weak and just needs warming up.

Edited by mat59
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I can recommend Stan and Gbox, they rebuilt my 996TT gearbox.  If your mechanic has experience with this car pulling the gearbox it shouldn't be that bad.  If memory serves I paid my indy under $1,000 in labor to get the gearbox in and out of the car.


Regarding the second gear issue, are you aware of the detent?  You won't really know the synchro is worn until they get into the box and obviously the detent wouldn’t help in that case.  But if the case is otherwise, it's cheap and easy to install.  Just wanted to let you know in case it's the issue.



I promise not to go off on a soap box diatribe but please, PLEASE, do not use anything but the OEM gear oil in this box.  Don't listen to the all people that say Redline and Royal Purple are the same thing.  Trust me, they ain't.  When you get Stan on the phone ask him how he feels about it........

Edited by Silver_TT
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  • 2 years later...

Hi All,


OP here. To recap, having originally thought the leak was from the axle seal, I had this replaced. It then continued to leak from a nearby area, which turned out to be the gear selector seal, which it would appear was due to the 'box being overfilled. However, I now have another leak from the same area! I've been under the car today and it's either the axle seal (again), or the clutch slave. I'm thinking clutch slave as there seemed to be a little fluid above the axle seal towards the top of the gearbox - hard to be sure as the fluid had mixed with some dust (I'm in Dubai..). Moreover, the reservoir in the frunk (green lid) is low. So, now I'm thinking I need a new slave cylinder!?

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