can i trade in a car i am paying a note on
You have to pay off the loan one way or another. If the car is worth more than what you owe then you are good. If you owe more than it is worth then you might be able to roll the owed amount into the new loan but your payments will be high and you will be upside down again - bad idea.
This depends on the dealer- some dealers will be willing to pay your car off just to move a new car off the lot- so, yeah
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