TSB 09-8-1 just addresses v6. I went to ford about this since it seemed to be a very common problem. I didn't get a definate answer about the price difference but the TSB says to "replace the radiator with the updated radiator" so I just assumed it was like a heavier duty radiator or something like that. They said they have replaced several. (It affects 06 explorers and mountaineers and 07 tracs made before 8/8/06) They did tell me that if you replaced the radiator that without the program update for the fan, that it would just do it again. They had one guy replace 4 in a year! I also asked about the tranny update and they made it sound like it the tranny update and fan update were two different updates and they would charge seperately for them. I havent gotten anywhere, yet, but I'm pretty irate since it came from the factory defected. IF you got radiator from ford and had them put it in and update the programming....that's almost $1,000. I filed a complaint with ford and suggest you do the same.