In Tremec's 2018 Performance Product Guide it says that their HP-MTF transmission fluid is only for Tremec transmissions produced from 2008 on. My TKO was built before then so I contacted them to see if the HP-MTF stuff was ok or not for my older TKO. They told me that the year reference was for differentiating the 6-speeds, T56 as opposed to the TR6060 - the TR6060 wasn't released until 2008. So there's a little trivia for you, and yes the stuff is good for older TKOs.