Running a 5.7 with a 545rfe with a stand alone PCM (2006 Durango) in my 64 Wagoneer build. Last piece of the puzzle is getting the trans to work with 4.11 gears and 37" tires. I understand that if i had the TIPM and ABS modules, i could change gear and tires in the VCM Scanner. Ive also gathered that a 2007 or 8 grand cherokee NGC4 PCM will interface with the TCM in VCM Editor. That being said, does the NGC4 require other modules besides PCM and TCM to make these changes? Can you make transmission ratio changes in the editor?