The Firestone RED Label Ride-Rite extreme duty rear air spring kit for 2011–2013 Ford F450 (2WD/4WD) is built with commercial-grade components to support heavier loads and harsher duty cycles. The kit includes brackets, air helper springs, hardware, air line and inflation valves, supports up to 7,500 lbs of load-leveling capacity and can operate to 150 PSI, while typically installing in 1–2 hours without drilling on many applications.
Firestone Ride-Rite RED Label Extreme Duty Air Spring Kit Rear 11-13 Ford F450 2WD/4WD (W217602703)