The Ford F-150 was introduced in 1975. One of the best-selling vehicles of all time, there are more F-150 trucks on the road than any other brand. Over the years, the F-150 came with an assortment of rear ends and gear ratios depending on engine size and options. Knowing the gear ratio of your F-150 is important if you have to replace the ring and pinion gears due to breakage, or if you want to change gear ratios.
Locate the “Vehicle Certification Plate” on the inside of the driver’s door near the door latch. The axle code is printed under “Axle” or “Ax.” You can use the chart provided in the first resource below to cross reference the axle code. You can verify the gear ratio using the next two steps.