When you say DAM box, are you referring to the unit on the (JD) header itselfIJ I would really appreciate some detailed info of how you did this if you wouldn't mind. Rek-Tin wants to sell me a kit for $ 225.00 to make this work. They then told me adapting to a JD head with the original IH header control valve isn't nearly as good as their complete $ 550.00 valve assembly. It sounds like you accomplished what I want to do with minimal alterations. I would greatly appreciate an email with some specifics.