It is just a typical thing to do, refinance your house or your credit cards, but your car loan can be refinanced also and many people never think of that. It is actually easier to refinance your car than your house. Your lender will refer to the Kelly Blue Book for an appraisal of your car.
If you want to give this a try, know that most companies who handle home refinancing also can refinance your car. A good place to start is with a Credit Union as they do more of this type of business than anyone else. If it is money you need, you can stretch your car loan further and lower your payments by a great deal. If your credit was bad when you got the car and now it has improved, you will qualify for a better interest rate and that will help you also.
Shop around and compare all the offers you get. Although many people will refinance their home a couple times, that is not a good option for a car loan. Houses last many years longer than a vehicle does.