New to this forum but I am having an issue with my truck. 2008 F250 / 6.4L with 115,000 miles. I have an H&S programmer, DPF/EGR Delete. Check engine light came on with P0607 code on the transmission. The truck runs fine, but will have a hard shift (almost like it was in neutral before it shifted) from 2nd to 3rd under a load (Not all the time). I have checked the batteries, connections, ETC. When it is in gear, no slipping or anything out of the ordinary. Ford Obviously wants to install a new tranny, however, I don't think that's the problem. Any help/guidance is appreciated.