Features & Benefits: Laser cut, CNC formed heavy-duty front/rear drop crossmembers. Bolt-on installation well almost. Some slight modifications will be required. OE-style cast iron knuckles have been precisely engineered to provide the ideal geometry to ensure proper alignment and improve the overall driving experience. Increases ground clearance. Includes our new torsion bar relocation brackets that keep the torsion bars in their factory location no need to lower the torsion bars to lift! 6" lift kits - Allows for 37x12.50 on a 9" wide wheel with zero offset. Available with ReadyLIFT SST3000 F/R shocks. Includes important differential drop brackets and CNC-machined billet Aluminum CV axle spacers. NOTE:    Some GM HD trucks equipped with Tow Package may require custom-length U-bolts purchased separately. Custom U-bolt length may vary by vehicle application.   If the ReadyLIFT kit's standard U-bolts are too short, ReadyLIFT recommends locally sourcing custom U-bolts built to each truck's specifications.