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The Firestone Ride-Rite 2400 kit adds a pair of air springs to the rear suspension of 2005-2007 F250/F350 4WD trucks, working alongside the factory leaf springs rather than replacing them. Air pressure is adjustable from 5-100 PSI so you can dial in support based on what you're hauling or towing.
This kit is compatible with in-bed hitch setups and includes everything needed for installation, including brackets, air lines, and manual inflation valves - the same style you'd use to air up a tire.
Confirm your truck still has its factory jounce stops in place before installing - this kit requires them.