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If he will not surrender the title and will not cooperate in getting a new title, you would file a motion for an order to show cause for contempt of court in the court where your divorce was ordered. The court will force him to either sign the documents or will issue a court order to issue title in your name. The court will also sanction him for not cooperating with you to get this done and will make him pay your costs and attorney's fees for having to take this matter to court instead of settling it like adults as expected by the court.