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If you purchase the older car and sell for 2000. Dealer will take your Pontiac for no trade value, add the payoff balance on your new car. Total you will have a loan principle of 5000.00. Payment is depend on the term (number of month) and interest rate.

first find out how much your car is worth. Then take off a good chunk of that and you will have how much they will give you for your trade in. They never give you how much you think its worth. New payment process will depend on your lender. You can usually get a better rate going thru the dealership than your personal bank, due to the dealership's ability to offer more deals than the bank. Look at what you owe, what you want/need, and how much you want to pay, then go talk to your personal bank if you have a positive relationship with them. If you want to do the dealership way, be ready. KNOW what your car is worth, and KNOW what the car you want is worth.

Good luck!

Yes but in all probability will need large sum of money down. If you owe 30k on a pontiac you are no doubt buried. Only with excellent credit could you get a loan for 125% of cars value which in this case is going to be more then 2000.00