Trannyman uses a 'special blend' of his own. Not sure whats in it...I don't want to know.

But I would recommend getting a good quality Dexron VI fluid. If it were me, I would go with Valvoline because it is synthetic and meets the Dexron VI specs. Not many fluids do this and I consider this to be one of the best.

You shouldn't have any problem running a synthetic trans fluid and it will only help you in the long run.