Here is something good as well: LubeGard. Now I'm not much of a believer in the "snake oil" junk but when I was building transmissions, a buddy of mine that owned a transmission parts wholesale company turned me on to it. I researched it and it made sense. My test was to drive the truck home from work without the additive, reach under and touch the pan. HOT! Pour the additive in and drive to work the next day, reach under and touch the pan, warm but not burn your hand hot. That in itself sold me and I have been using / recommending it ever since. This was on my 85 with a 700R4 I had overhauled.
Food for thought....
http://www.lubegard.com/LXE.aspx