Maybe they were referring to the fact that programmer's don't make as large of an impact on engine/transmission performance of the 3.6L as they do on the 3.8L. It is possible to just reprogram to account for the larger tire radius.
Very large difference in speedo and odo readings. Gas mileage was reading way off as well before I flashed it. The flashcal doors not change shift points you have to get the actual programmer. I'm not sure if the procal does.