Replacement transfer case availability

[geoff]

2008 Cayenne S, making noise diagnosed by mechanic as needing a new transfer case based on the noise made under hard acceleration. New transfer case ordered from Porsche late 2018. When I stopped by the dealer to check on status of the order yesterday, I was told it's on indefinite backorder.  Are there any alternatives?  Does a VW Touareg or Audi Q7 transfer case work exactly the same, and are they equivalent and available?  So frustrating

[geoff]

To answer my own post - a while after posting, I found a local transmission shop that had the smarts to figure out the problem. The guts of my transfer case was made by Borg Warner according to the transmission shop.  I found replacement seals and belt at 

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  The noise I was hearing was due to the belt stretching out over the years, and hitting the inside of the transfer case housing under load. Here are a couple of pictures of the inside.  In the almost 2 years since I had the transfer case rebuilt it's been problem free

[hahnmgh63]

Thanks Geoff, I've got 105k on my '06 CTTS and I'm thinking I might as well just keep it for the long run. I know some things will pop up over the next few years and I've heard of a few with stretched chains, and the Turbos have the same chains as the V6's with over twice the Torque.