I want to say it was about 4 years ago when I registered my jeep as an ohv. The lady at the dmv said they had recently changed the laws and that it was alot easier to go back to a normal vehicle. They took the title from me but the vin # remained the same. So if I wanted to go back it was just a matter of changing the registration and issuing a new title. If they issued you a new vin when you went ohv I'm not sure.