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If you had a bad loan initially, I am assuming there were credit issues in the past. If there were, and you have recent 30 day lates, you may not be able to get a refi or get another car loan. Also, in this credit market, you are highly unlikely to get a car without a down payment (even more so with a recent late on a car note) and you would have to qulaify based upon both the new payment and the old payment...Again, unlikely. On top of that, you could end up with a judgement from the repo that could end up a garnishment on your paycheck making it problematic to keep up with the newer car payment..
So, no, do no try the bait and switch routine of buying a new car and walking away from your old one.