I don't beleive the transmission slip part of the edge. Mine would show, 30 something even 80 something when I had never even felt it slip. I would reset it, put the box on level 5 and dog it. No slippage. The next morning running on level 1 mildly accelleration on an on ramp and it would report 35 % slippage again, which again I didn't feel. I narrowed it down to if the truck is less than 140 degrees in temperature and you even mildly get on it, the edge said the transmission slipped. I love my smarty though. It pulls way harder than the edge
ever did. You will love it on a stock truck.