In case this helps some one else here is a Transgo FAQ I found. TransGo
Since my TH350 is used and has wear does it make sense to add a shift kit or re-programming kit? Should these kits only be added to a fresh re-built trans? I ask because I know of one person who added a kit to his TH350 and the trans went out after that. I don't know what kit he installed or the condition of his TH350 before the install.