I am going to rebuild the 727 in my 72 D200 real soon. I use to just grab a middle quality fluid off the shelf for my servicings. But now, there are a metric butt ton of fluid options. I spent a lot of money getting good parts for this tranny and I want them to last. I do not want to spend money just for the sake of spending it though. So, I wanted to get some input from others who have some experience with these trannies and the different fluid options out there.