If i payed off a car i co signed for and the other person sold the car do I have any rights?

You say you co-signed for the car for your ex but don't indicate whether it was while you were still married or after the divorce. Depending upon the wording of any property settlement agreement that may have declared the car to be her possession, if this were strictly an agreement between two parties, you would have a right to sue your ex for the remaining balance or at least a portion thereof.