Legal Question in Family Law in Texas

If you purchased the vehicle during marriage with money from your job, then it is probably community property irrespective of how it is titled and she has as much right to it as you do, under the law.

I would file for divorce, ask for temporary orders, and in the temporary orders ask for the court to award you temporary exclusive use and possession of that vehicle.

Of course, because you both have equal rights to the vehicle, you can just go grab it as long as you can do so without disturbing the peace.