I called Sonnax They don't know who has tools!
I live in Thousand/Oaks CA north of LA Anyone know a transmission place that has tool to replace valve body?
You need your valve body rebuilt with Sonnax kits OR you can buy a rebuilt valve body with Sonnax kits.
Contact Sonnax for a shop that uses their tools and most likely they will know how to handle your valve body.
See the link "GM no reverse info" in my signature for a more expanded answer