Can you hide a car in a garage until you get the payments if you know you will be coming into a great deal of money the next month?

Yes, you can secure the vehicle in a garage.

They can't get the vehicle ( if there is no court order) and when you get the money, pay up.

Most people do keep their cars in a garage, so what's the difference?

NOT legally. Its called "Hindering a secured creditor" in most states.