I am going to be installing my Dynotech Transmission in a week.It was run with Dex 6 for 3500miles.Seeing how i do not know if i will like how firm or soft the shifts are should i just use the Dex 6.Not sure if i will have to drop the pan.I heard that if the product has Dex 6 from day one Dex 3 is not allowed.But if it had Dex 3 you can use Dex 6.