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The Ford F-150 trucks come with varying gear ratios in the axles depending on the options you select. You can identify the gear ratio by checking the code on the differential cover. For example, the code I6 indicates a 3.73E gear ratio, with the "E" signifying the presence of an electronically controlled locker. Different axle ratios serve different purposes, with some being more suitable for towing while others are better for off-road driving. If you want specific recommendations for your needs, I suggest contacting a Ford dealership as they are best equipped to provide tailored advice for optimal performance.
The axle code "L6" on a Ford F-150 corresponds to a 3.73E rear axle ratio.