Hitekrednekjoe

Hi all, after pulling my 7000lbs trailer my rig hasn't been shifting right. My truck is a '12 fx4 ecoboost with 62,000km on it. Now it seems to shift 4-6 really quick and will put me in sixth in a 50km/he area. Which makes me have to floor it to get going. And when it does downshift, it's clunky. Tranny on its way out? Or is it an ecu problem? Thanks in advance