There is one possibility.
Require the buyer to post a vehicle title bond so he can get a title in his own name when he takes possession of the vehicle.
The following page explains the process:
http://smallbusiness.chron.com/texas...ess-13055.html
And here is the application:
http://www.autotitleservices.com/Forms/vtr-130-sof.pdf
I suggest you go with him to the DMV and make sure this gets done properly and don't surrender the car until he has posted the bond, completed the process, and obtained (and showed you) a title in his own name.

