Realistic estimate Please

The "Spline Count" is only important for the tranny going in, to determine the type of converter correct? it does not matter if a different spline count transmission came out, unless I am reusing the converter? Just trying to verify.

Also anyone know if the colour of the converter means anything?

The one in my 727 is Blue, and the one in my 904 is red?

You got it right...the spline count of the in-going tranny must match the converter you are going to use. I have no idea about T/C color coding if they are stock. Might mean nothing. Maybe someone else has some perspective on this.