Can I legally take the car I consigned for?

A year ago I consigned my boyfriends car and now we are no longer together. I have been asking him to get it refinanced in his name so I am no longer liable but he has not done it. Since my credit is better they put my name first and I am also first on the car registration. So I guess I am also a co-owner. I live in Tennessee and from what I've read since the registration says my name "and" his name, I would need his permission to sell the car. if worse comes to worse and he refuses to refinance it, is it legal for me to have the car towed to a safe location and inform him he needs to refinance the car before he gets it back? Is there any other course of action I can take to get this car out of my name?