Conversation Between Aspkiller and Bilal928S4

I am located in CT 06840. It is not that I need a transmission, but I have 117K on the car and was just wondering when it will need rebuilding and saw a freshly rebuilt with warranty for $1900 delivered with the PSD as I have a 1990 928S4 with PSD. The spec said it is out of a 90 S4 also.
Then the question is, should i rebuild my own tranny as then it would remain a numbers matching car?