cardaily

hi everyone I've been having serous issues with my 2014 GMC Sierra and need any advice possible I recently replaced my transmission with a used unit and I've been having constant issues of losing all my guages/ fans kick on high/ loses all power/ I got a list of codes that I will post and the truckIMG_5198.HEIC goes into a fail safe mode and the truck just over all freaks out after the installation of the transmission I believe there is something wrong with internaly with the trans but I need advice thank you