If you want to sell it with your custom tune then you should post your old HEX code since the custom tune wont work on another truck unless it has the same HEX code and the same modifications. If you sell it you need to make sure that you have set your truck back to stock. the person you sell it to can reset the programmer to the canned tunes if you forget to as well, but setting your truck to stock is extremely important or else it will cost $75 to set it back without your truck present.
hope I helped
