This Arnott coil spring conversion kit was exclusively designed for Ford Expedition and Lincoln Navigator four-wheel drive (4WD) vehicles needing to replace the OE Shocks along with the air springs. This kit converts the rear air springs of the vehicle to a reliable coil spring suspension system. The kit features durable powder-coated, variable-rate coil springs designed to provide a softer, more comfortable ride when the vehicle is carrying a light load, but a firmer ride when the load increases. This kit also includes a pair of OE-equivalent replacement shocks.