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Don't forget that once you have that original code you can change it to whatever you want. I think you just put in the old code, hit the 1-2 & 3-4 button (the door locks should go up and then down), then enter the new code and I think it the 1-2 & 3-4 buttons again. Someone here should have that exact sequence.
I mention this because I was told that it couldn't be done on my 2004 SuperDuty and then when I bought the 2001 Eddy Expedition they told me how to do it. Helps to talk to the right people!
ericnj75,
Look under dash drivers side. Control module is white box. Look for sticker affixed and for 5 digit number on sticker. Worked on my 99 E.B. Hope this helps.