The ICON Vehicle Dynamics 4 Lift Front Leaf Spring pack for the 2000 - 2004 Ford F - 250F - 350 and 2000 - 2005 Ford Excursion feature ICON optimized spring rates for trucks equipped with diesel engines for unparalleled ride quality and on - and off - road performance while also providing 4 of lift. These leaf springs are constructed from 10, thinner than stock leaves to minimize stress and provide increased wheel travel compared to stock when paired with ICON shock absorbers. OE style bonded bushings are replaceable as they wear over time and eliminate the need for periodic greasing while ensuring noise free operation. Wheel with confidence knowing that these leaf springs are covered by ICONs Limited Lifetime Warranty.