W.H, Try not to worry. Your H is acting like an a$$ because he is so pissed that he didn't get his way. My H also tried to use threats after I didn't go along with his plan.
You are protected financially because you've already been in front of a judge. If H tries to violate what has been decreed he could be in some very hot water.
Do not let him hoodwink you. Assets have not been separated yet, so yes the car is a marital asset.
He is so mad he's spinning and spitting and will say anything he thinks will get you to back down, worry, or threaten you. Don't let him see you sweat. Keep a record of these incidences.
The best thing you can do is stay under the radar. Do not contact him unless it has to do with finances or kids and make sure it's necessary when you do.
Let him whirl and twirl and hopefully he will eventually burn himself out. It's takes them a long time (if ever) to connect the dots that there are consequences for their choices.
Hang in there and keep track of things from a distance.