Do i need to update my Diablo? i dont seem to have the shift firmness (line pressure) adjustment avalible on my tuner?
The SRT8's don't have that. It's only for the 5.7L. Basically, it's the same TCM/trans. The TCM can be put into different "operating modes" by the PCM. What the shift firmness adjustment does on the 5.7s is to put it into the SRT8 operating mode (firmer shifts). You're already there.
