The Rancho Suspension 6" Suspension System for 2018-17 Ford F-150 Trucks, No. RS66506B, is precision engineered to offer easy installation and improved performance. The system features a reinforced, fully boxed welded subframe manufactured from high-strength, low-alloy steel and DOM tubing, and is designed to minimize vibration and ride harshness. The components are carefully designed to ensure precise fit and maintain proper CV joint and drive shaft angles, steering geometry, track width and factory location of the rack and pinion. A pair of bolt-on 6” strut spacers for the front of the vehicle can be easily installed without disassembling the factory struts. No drivetrain modifications are required for the system, which utilizes OE tie rod ends and fits up to 35” drivers.