The easiest way to identify the axle and gear ratio in your truck is from the door sticker. If you open the drivers door and look at the door jamb, you’ll see a sticker like the one shown below located on the latch face. This list has the most common codes for the 2011+ F150's and it not an extensive list.
If you are unsure if you have a 9.75" or a 8.8" Super axle, this is a quick way to check.
