I have heard Dexron from some trans builders and Type F from other builders. Maybe we should use 50% dexron and 50% type F. I have been using Mobil 1 ATF. It is Synthetic and for all transmissions, at least that is what I was told. I have aprox. 950 passes on the 727 in the Lebaron with same Mobil 1 fluid as the first pass. This is the beginning of 3rd season. No band adjustment or any maint. at all. Still cherry red and smelling sweet. Won S/P and made it to semis in FB this past sat night. 15 passes in 1 night. Now let me go find some wood to knock on.