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In most cases, Ford F-150 axles have a small tag on the rear axle's differential casing for identification purposes. However, axles manufactured by Dana have a different marking system, with the same information but stamped on the casing and shaft instead of a tag. This marking includes details such as the axle's production date, factory origin, ratio, pinion gear, and model. When working on rebuilding or fixing the axle, it is crucial to have access to this information. The tag contains five data sets, while the Dana axles will have three sets stamped on them.
The Ford F150 offers various rear axle gear options, and you can determine the gear ratio by looking at the first three numbers on the tag. For example, if it displays "3 55", your gear ratio is 3.55.