I think that I have the first non-Lincoln installed SST in a V6, with the help of LLSOC members (LS4me being one of them). You will lose D4 function, in return you get a straight to 3rd gear function. I have not had any issues with it and the dealers, when it was still under warranty never questioned it. There were 2 or 3 of 2003 press test cars that had V6 with SST, one being in Canada last I heard and it had full function of the SST with D4 included. I have never found a dealer that would reflash the transmission module with the 2003 V6 vin. that had the Lincoln installed SST. Other than that it has been great. I say do the install.