I'll be happy to help you with this, but I will need your help to clarify some information.

I understand that the price of the new car is $27,000, and that the trade-in value of your existing car is $17,000. What do you mean by "my car balance is $26000"?

Also, assuming that you are financing the entire net price of the new car, what are the terms of the loan? What is the annual interest rate? How many months/years is the loan for?