This is the Firestone Ride-Rite Air Helper Spring Kit, part number 2170, designed for rear axle use on Ford F-53 motorhome chassis (model years 1999-2004, 2006-2009, and 2011-2012). It mounts between the vehicle frame and suspension, offering adjustable air springs to support heavy loads while keeping your rear suspension level.
Manufactured using heavy-duty rubber convoluted springs, the kit comes complete with upper and lower brackets, air lines, inflation valves, and all necessary mounting hardware. It is painted or finished in a protective black coating to resist corrosion and built to withstand frequent load changes. Inflation range spans from 5 to 100 PSI to suit light to full load addition.
With a load support capacity of about 4,800 pounds for the rear axle, this kit helps reduce leaf spring sag, minimize bottoming out, improve steering control, and reduce tire wear. Whether you’re carrying heavy gear or towing, it enhances stability, ride comfort, and safety. Installation generally takes 1–2 hours and ensures your motorhome rides smoother and handles better under varying loads.