Convert standard manual valve body to reverse - what is needed?

Looking for insight on what I should expect converting the standard manual valve body to a reverse manual valve body on my 904?

The transmission and converter were built by Dynamic a little over 2 years ago. Everything is running fine. I just really do not like upshifting toward drive. I’ve missed a time or two in spirited driving.


To convert from standard to reverse do I have to replace the entire assembly?

If I need to replace the entire assembly, should I go with something from Hughes or TCI or other?

Thank you for the knowledge as I start to dig into this project