i am in the middle of swapping a 2003 auto tranny from a spi into a 2000 spi auto car. I was told the Pcm needs or should be reprogramed for the latter model trans. I have done alot of research on the motors but not the trans. The new motor and trans came as a package. The new setup has only 3000 miles. It came from a wrecked rental car. The auto body shop that I bought it from warned me not to even run it. Let alone drive. I have to tow it to the dealer to have this " reprogram" done. Any help would be used and great. Thanks