Last week I got my Tahoe back from engine builder - cam'd, head work, AFM/DOD delete, overbore, etc. When I went to pick it up the 1-2 shift was VERY hard, and I had them take it back to dyno-tuner. However, he went too far and not she shift's sluggishly in all gears. I uploaded the dyno-tuner's tune to my Diablo I3 successfully. From one of you smart guys out there..... Can I connect my Diablo I3 tuner and change the shift pressure ONLY??