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Broome, your Ford came with synthetic in the differential, too. Mine did, including the 1999, 2003, and 2005 years.
I need to check the Ford "rules" on synthetic oil in the engine. I don't think they care but will they care about extending the oil change interval if there is need for warranty engine work? I run Rotella T but not the synthetic. I wouldn't mind using synthetic but not if I have to change the oil every 5,000 miles or so. Synthetic is too expensive for that. Keep in mind 5,000 miles for us is 6 to 7 weeks.
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