For 1999-04 08-16 Ford F250 F350 Super Duty Ride-Rite Rear Air Helper Spring Kit. NEW Ride-Rite Rear Air Helper Spring Kit for 99-04 08-16 Ford F-250/F350 Super Duty. Supports up to 5,000 lbs per set (not to exceed vehicle's GVWR) and should be maintained between 5 -100 PSI Provides load support through the use of air pressure that can be adjusted for changing loads Enhances the ride by reducing inter-leaf friction Individual inflation valves that allow for separate side-to-side or front-to-rear adjustment Most Ride-Rite kits are no-drill systems that utilizes vehicle's factory holes and mount between its frame and suspension Easy installation that typically takes 1 to 2 hours.We stand behind every product we sell. We define the item as defective only if it doesn't function as described. FEEDBACK IS VERY IMPORTANT TO US.