While that is correct, you're also asking your truck's engine to turn a very heavy 37" tire and wheel combination at that stock rev range, which can still make your truck feel sluggish (depending on your engine, tuning, and other performance parts), which is why we generally recommend 4.11s for 35" tires and 4.56s for 37" tires. Granted, you will get a bit better fuel economy with a 4.11, and if you have an EcoBoost F150 (especially one that's tuned), then you can still do 4.11s without much fuss.