Firestone Ride Rite Air Springs. Most kits are No-Drill systems easily installing in 1-2 hours. Fits the following Ford models: F250 (2WD only) Gasoline 11-15 F250 (4WD only) Gasoline 11-15 F250 (4WD only) 08-10 F350 (2WD only) 08-10 and F350 (4WD only) Gasoline 11-15. Features of Firestone Ride Rite Air Springs Manual Fill Kit Load Capacity: 5000 lbs. No Drill Installation Minimum Air Pressure: 5 PSI Maximum Air Pressure: 100 PSI Install Time: Roughly 1.5 Hours Package Contents: Firestone Ride Rite Air Springs Firestone 2430: 2430 Ride Rite Air Springs