Has anyone here ran dexron6 in a 727 transmission or a A-518? I have read it is fully back words compatible to dexron3, From what I have gathered it should provide the same shift characteristics as dexron3 but it is synthetic and will last a lot longer and protect a lot better against heat. I have a non lock up A-518 that I have been running dexron3 in, but I am seriously considering trying the new dexron6.