Has anyone traded their vehicle in for something cheaper, while still owing on the original car? We have $21k left on my 2017 Acadia, but I'd love to get rid of that $400 car payment as quickly as possible. I just don't know how any of that works. Is that a bad idea? Our interest rate is 3. 5% on my car right now. Should we just hussle to pay it off or try to figure out a way that makes sense to get a cheaper car?