Your Old x husband will need to be removed from the deed. If he agrees without any objections all you will have to do is go to you local Title Company. They can draft the docs. Deeding the property in full in you name all he has to do is show it was deeded for a small amount..ie $10. Then once you are done you can have them add your new husband.
Since the property is PAID IN FULL and it was purchased prior to this husband. I would reccommend you DO NOT place him on the title. If you do he has 50% of you equity.
Keep him on the straight and narrow. This way if things go South of the border you will still have all rites on the property as long as these mariage laws are applical in you state.
You local title Company Can help or go to a RealEstate attorned to Draft the Deed of trust.
GOOD LUCK