Frame Kit, 4 Link, 28 Inch, Coil Spring Mount, 2901-3900 lbs Coil Springs, Made to Order4-Link Frame Kit, 28" Width, 3-Way Adjustable Shock, Progressive Rate Spring for 2,901 lbs to 3,900 lbs overall weight. Frame Kit comes with the following items; • 4-Link Frame Rails - Specially engineered profile clears suspension and axle components while accommodating low ride height and wide tires; Rugged 2" x 3" construction makes them strong without adding unnecessary weight • 2" x 3" crossmember - Mandrel fromed for uniform profile; 3.5" drop center makes it adaptable virtually any chassis design; 60" wide • Diagonal Link - 3/4" O.D. DOM steel with 1/2" Spherical Rod Ends for easy, on-chassis adjustment • Driveshaft Loop - 1-1/8" O.D. mandrel formed Round Tube contains driveshaft during U-joint failure • Shock Crossmember - Tubular design provides high strength with light weight • Upper & Lower Shock Mounts - Provides 6" of ride height adjustment • 4-Link Kit, Part No. C2017 - Offers enhanced adjustability over a ladder bar suspension for increased performance • 3-Way Adjustable Shocks, Part No. C2051 - 3-Way Adjustable Shocks with lower shock mounts that have 6" of adjustments in ½" increments • Springs - 2.5" I.D. x 12" long, premium-grade chrome silicone steel, powder coated for durability. Progressive Rate Springs for a vehicle with an overall weight range of 2,901-3,900 lbs.