Have an 08 nnbs silverado with a 5.3, originally had 4l60, now it has a 4l80. Does anyone know if I have to do a segment swap or if even a segment swap can be done on the e38? Do I have to replace the tcm only from a 4l80 nnbs? Or do I need unlimited gen iv trucks credits and flash a 4l80 os in the current pcm? Thanks for the help