I'm not seeing that code either, but most of my info is for 99-04. Being that you have a F250, there is a GOOD chance that you have a 3.73 10.5in sterling in the back and a dana 60 (I believe) in the front.
Crawl under the rear of truck and read the tag. It will say something like "3.73 10.5 ???" or "L.73 10.5 ???".
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