Rock Krawler coil springs specified for the 4.0in X Factor Pro system with billet aluminum arms are intended for 2017–2022 Ford F250 and F350 4x4 trucks to achieve the system’s ride height and handling balance. These springs are supplied as part of the Pro-level X Factor package and match the tuned geometry created by billet aluminum arm upgrades, supporting the overall lift and suspension calibration for those model years.
Rock Krawler 2017-2022 Ford F250/F350 4x4 4.0in X Factor Pro System w/ Billet Aluminum Arms