i am currently behind in my auto loan payments by two months can i still trade in my vehicle for a newer year model? And need time to come up with a down payment

Different dealers are willing to take different amounts of risks. There is a greater risk associated with your situation, so it could be harder to find a dealer. If you are able to get up to date on your loan, and save up some more money for the down payment, you would be better off.

Another possibility is if the value of your current car is higher than the car you are interested in getting. Look up the Trade in Value of your car, and then check new car invoice prices.