not sure what my signature says, been a while since i think i updated it, but basically, all i got is the LLY with EFI live DSP5 from duramaxtuner, an AFE intake elbow, and exhaust. now, when on any level over 3 and when i am going about highway speeds, 45 MPH +, when in 5th gear and i floor it to get around someone, the truck never down shifted and then BOOM, it slammed into i believe 3rd of 4th gear and through a code. so i slow down to a light, and then i get going and there was no 1st or second. it felt like just 4th or something. i have had this done a few other times. does this mean that the tranny just went into limp mode? and does this happen to anyone else? do i got a TC going out?