I am not sure about in ohio, but in mi you have to have a differential in the rear end or it can not be made street legal...... I have seen a few guys install a street bike swing arm and rear tire on a four wheeler to make it street legal. they said it was the only way around the stupid differential law.....
good luck man, I would contact your police department and see what they say... I am sure you will have to get it inspected before you can register it.
Let us know what ya come up with.