Thanks guys.
Under the house was a mix of galvanized and PVC. Galvanized was pretty clean inside. I did not need to thread any of the galvanized. Just had to cut it to get it out and then removed it at an existing joint. Used a Tiger Saw with a cheap but fine toothed metal blade. Went through it like butter. Had a very hard time getting the shower valve body and pipes out of the wall without damaging the sheet rock on the other side (of course it needs an access panel anyway but the kids had just painted that wall and didn't want one yet.) Screwed the brass fitting with a Pex barb into the galvanized joint and then connected it to the Pex. This little house is 60 years old, was not a high quality thing to begin with and has been endlessly bodged over the years. I did use the Sharkbite connectors in the wall. They may in fact fail one day but as it currently stands they are probably the safest connections in the house. Plus, there was so little room it would have been hard to get the crimp. I did crimp where ever I had room to do so. They will probably only be in this house for a few years.
In this area copper has problems with well water. It stains everything greenish blue and unless you have a good filter the sand and sediment in the water will wear it thin. We had three major in-the-wall and in-the ceiling leaks with copper pipes that were around 2o years old. You could literally collapse the pipe between your fingers.
Anyway, I want to thank you guys once again. You always come through for me when I need the right info and need it fast.
darn so I have to pay for the repair.