All this talk had me curious of best way to tell for sure what my ratios actually are on my elderly Expeditions. A search of some Ford forums found this answer to the question.
Quote:Crawl under the rear of the SUV. There will be 2 metal tags on the rear diff cover. 1 has the recommended gear weight oil (such as 75W140), and the 2nd will have the gear ratio. For example, 3 73 or 4 10. If it has a limited slip rear diff (most with trailer tow do), it will read 3L37 or 4L10. I hope this helps... Quote
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