Drained the oil from the transmission today and reconnected everything going to the tranny. I will use Type “F” transmission fluid. This is what Coan recommends (They also like Amsoil). Years ago, TCI recommended Type “F” trans fluid, and that is what I have used every since in all my transmissions. With the exception of this last re-build, I put in Lucus Semi-Synthetic trans fluid for 11 runs.