Sorry, I cannot answer your question. What forms you need—if any exist—are matters of Ohio law. Every state has its own laws and rules controlling cars registered in that state.
I practice law in California. While I am familiar with general rules and methods of estate planning, which are similar is all states, I do not know the details of each state's law regarding matters as specific as what you are seeking. You either need to do your own legal research into Ohio law, or hire a lawyer to give you the answer. [Nolo Press, in Berkeley, provides an excellent book, "Legal Research: How to Find and Understand the Law," which could help you find the answer to your question.]