The current owner must provide proof of identity (see proofs of identity). If the vehicle is already properly registered and has legal license plate(s) on it, then yes, you can drive it legally without a title.The new owner must give the original bill of sale to the DMV along with the other required proofs of ownership when they title and register the vehicle. You can only transfer ownership (title or registration) of the vehicle. Is a Bill of Sale required for selling a car in New York? This is the motor number or serial number required for identification purposes. Without a vehicle title, you have no way to prove you've obtained the vehicle legally and have a right to sell it. When you're buying or selling a car in a private sale, the title information must be filled in correctly to transfer ownership from the seller to the buyer.