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Does anyone know if there’s a place in the US that rebuilds the 958TT transfer case? I’ve seen a few videos of people rebuilding them in Russia and found a place in the UK that will do it, but there must be someone in the US that rebuilds them too.

 

Since it looks like mostly what happens is the chain stretches and the clutch pack wears out, I can’t imagine it being too hard. 

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You may want to checkout: https://rennlist.com/forums/cayenne-958-2011/1079182-958-gts-transfer-case-rebuild-wish-me-luck.html#post15148042

and: https://rennlist.com/forums/cayenne-958-2011/1080636-transfer-case-teardown-pictures.html

 

We're (Rennlist) hoping for a good DIY with photos. There is another chap there doing his case and he's promised to video it. I would imagine any competent shop would be able to handle it. The failure really appears to be caused by rust in the clutch pack, giving some credence to Porsche's modification of the case vent.. and to change the oil at semi-regular intervals (pretty much settled at 20,000 miles for mine.. the oil is cheap. It's easy to do.)

 

Although this chap did change the chain - he didn't offer photos of the new vs old chain side by side to see if there is any significant stretch.. so I'd be less concerned with that. What it does show is the transfer case is not undersized - there appears to be no notching of the clutch pack teeth or housing which could be expected if it was undersized.

Edited by deilenberger

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Yeah I actually posted in that other thread as well. I'll probably end up ordering the parts from AWD.tech and rebuilding. Several fluid flushes haven't resolved my shudder and noises. 

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If you can find a performance shop that works on differentials, or even a 4-wheeler shop that does things like other brand transfer cases - there isn't anything magic I see in the Porsche case that would cause them a problem. Be worth Googling your area for shops like that.

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