Tom's Bronco Parts' 5.5" Suspension Lift Kits for 66-77 Ford Broncos are built using all high quality components to ensure a comfortable ride and unbeatable off-road performance. Our 11-pack leaf springs give you the best of both worlds, providing a soft ride along with excellent off-road articulation. These leafs include silencing pads between each leaf to offer a quiet ride and the front double military wrap offers added strength and protection against breakage. For the front Coil Springs, we offer progressive rate coils. The softer pre-load spring layer produces a comfortable ride and excellent articulation. As more force is applied (turning, braking, etc.) and the pre-load springs fully compress, these springs progress into a stiffer coil to provide the extra support needed to help limit the unwanted effects of body roll.