Everything works 100%
Tj is a 98
Durango donor was a 2000, that had an issue where it would run 20-30 min and would die and not restart, I believe that was the " no bus" problem. It actually did that in the Durango before I pulled it apart.
I forget the truck pcm maybe 99. It had a code for the rear o2 sensor and if I watched live data while it was running, it was not reading the sensor. It wasn't the sensor and it wasn't my wiring. So I decided to try another pcm, which is the molar performance 2000 Dakota r/t pcm. I am not against having a custom tune done from someone like flyinryan, but I need a good pcm.

So back to my original question, what is going to happen when I put it in 4 low? With a 2WD pcm? Does anyone know?
And can I have my 2WD pcm tuned to a 4wd?