Increased ground clearance Maintains factory progressive rate coil springs Track bar bracket keeps the front axle properly centered. Fits both rear coil spring and rear air ride suspension models! Radius Arms offer a more factory-like angle and feature a durable, durable rubber Bushing for maximum vibration absorption. Rear ride height arm brackets let you adjust the rear ride height, up to 1-inch higher than the front – Air Ride models ONLY Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use.