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There should be a small metal tag on the rear diff attached by one of the bolts. if that one is missing then check on the front diff. They have to be the same or you will do massive damage to your truck in 4X4. If they are both missing you're going to have to open the rear end and figure out what you have. You may have heard terms like rear axle ratio or final drive ratio. These refer to the gear ratio in the differential. If the final drive ratio is 4.10, then the ring gear has 4.10 times as many teeth as the input pinion gear. You could count teeth and figure the ratio out.

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Q: How can you tell the gear ratio in a rear axle on a Ford F-250?
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