Only The Gen 3 ECM has a build in TCM .. Anytime making changes for stall , tire size and shift points we will need a TCM. 2007+ T42 TCM can be found behind the PCM a 6l80/6l90 the TCM is found inside of the transmission. You will have to remove the valve body to access the TCM to send it in.

Casey RanceMPIV2, HPTuners, MOT