Erik, why is it you always have all the answers to all my questions !! You may or may NOT remember me posting a while ago about how to run a BMW I-6 on a GM ECU, once again you had the answers.. Well fast forward a bit, that car is basically finished but I elected NOT to convert the BMW engine over to GM ECU, it was going to turn into more of a project than I wanted on that old of a car..

Ok, so fast forward to last December, I did acquire a 2003 RCSB Silverado that's 4x4. Currently I am researching suspension options and have pretty much decided what I want to do.. I went so far as to acquire a 6l80e and an AWD Tcase from an '09 Escalade for a song. I want to put it in the Silverado and you've answered almost all of my questions, I do have one more that comes to mind, will the stock cluster continue to talk to the new ECU or does that require an upgrade as well ?

Thanks man, guys like you are the reason that forums like this one are such an awesome wealth of helpful information!