Inside your fuel door should be a sticker, it tells you if you can run E85 or not. There's a whole section in your owners manual that tells you about using E85 and what to do if you do. If you dont have an owners manual go to the RAM website, you can still download one for a 2004 for free!
If you have your window sticker or build sheet check the sales code for your engine, Both 4.7's for 2004 are "Magnum" engines. Sale code EVA is the gas only engine, EVD is the flex fuel/E85 compatible engine.
Last edited by Fleet Guy; 03-08-2012 at 10:56 AM.