The rear shocks do not add any ride height. On a solid-axle, leaf-sprung rear suspension, the shocks just provide damping. To add rear ride height you'd need larger rear blocks, lift shackles, an add-a-leaf kit, or new leaf springs. In general, it takes about 2.5" of front leveling to get the 2021-2022 F150s to a "dead-level" stance. The coilovers come out of the box at around 1.5" of lift, so to hit the 2.5" mark, you'd need to adjust them up. As far as your tire, we would need to know the wheel width. Your best bet would be to give us a call directly at 623-434-5277 or email us at [email protected]