Well, after reading some post's on this site about the Predator "zero'ing" out the TM. I decided to program mine back to stock until some more light is shed on this discovery. I have the 2wd, but I don't want to mess up the tranny. I drove around for a while with it back at stock, and let me say this. After having the "Diablo Tune" for a few months, and then programming it back to stock there is a significant difference. The Diablo certainly made it quicker, and I hate knowing that my truck is slower!! But I guess its better to be safe than sorry. The shift from 1-2 is so much "wimpier". The "firm" neck snapping shift is gone. I like it better with the tune, but I guess that explains the TM being zeroed out. TIME FOR THE VECTOR TUNE!!!!!