p987yow

My third TC was installed in my 2016 Cayenne Base in Feb/19 - with the new GNC coated plates. Since then, I have put nearly 20K miles on vehicle - the mileage when the previous two TC's started to fail. So far, my Cayenne is running well - without any TC fluid changes. Has anyone replaced a TC with the new GNC coated plates? Has this new TC case resolved the failure issue?

RAudi Driver

GNC? Is this the factory upgrade or aftermarket?

p987yow

Factory replacement TC - they went into service around October 2018. There is Technical Information Service Bulletin dated September 26, 2018 stating "Only modified transfer cases with GNC-coated plates are supplied from now on".

geetee

just curious...why don't you replace the TC fluid at every oil change?

p987yow

Porsche service advisor recommended not changing fluid under warranty. Now that I am out of warranty, I will start changing fluid every other oil change.

deilenberger

Is there any explanation of how GNC plates differ from the ones that came with the cars?

kari

I got the new GNC case Jun 2019 but i haven't clocked the mileage yet...

This is the link to the TSB: https://static.nhtsa.gov/odi/tsbs/20...45566-9999.pdf
LU2 – Transfer gear reinforced

An interesting read on gas nitrocarburising .. https://www.linde-gaz.pl/pl/images/F...m48-461074.pdf

CAVU

https://rennlist.com/forums/cayenne-...l#post16271057

Kirill

There another revision to clutches - came out at end of 2019 - the "diamond clutch" and just like all of half a dozen of fixes before it - supposed to be the one that doesn't break.