Hi,



I have to change transmission in my 955 Cayenne S, and I need to know I transmission from 2008 957 Cayenne S fits to my car? I know it will be jut bolt on, but I wondering if there is any major software difference in TCM. I already have new updated TCM so I dont need pressure switches in valve body any more. If I'm right, there is no internal difference in transmission, so I believe it should work. I can also get TCM from this transmission, but I believe it would be problem pairing it with ECM (DME engine control module).



I kindly asking for any help.



Thank you

 

It will not work. The ECU will not be able to communicate with the TCU. Same goes with trying to install a 958 Cayenne 8 speed tiptronic inside a 957. Won't work.

 

I agree with you. But we have to know that 955 and 957 have basic the same transmission, so probably there will be no need to change TCM.

 

I still wonder if the new TCM will communicate with the other computers. They may not like each other.