A industry first and patented design, Belltech?s drop ball joint uses the drop spindle concept to easily and effectively achieve a full 2? drop. By relocating the mounting point of the lower ball joint, our engineers were able to provide a 2? lowering without affecting suspension or steering geometry, not even the shock absorber! Belltech Drop Ball Joints offer improved handling and retain factory ride quality. Belltech Ball Joints help maintain critical suspension geometry and eliminate excessive wear and tear common to other methods of lowering. Each Ball Joint is built from (Powedercoated) OEM grade high strength ductile iron, providing the structural integrity to meet and exceed all factory specifications & requirements. Fits 1988-91 Chevy C1500 Silverado/Sierra Standard Cab Only 2WD Only "OBS body style trucks". Check the Manufacturer's website for a listing of all vehicles this part can be used with. 2? Drop Spindle. 15? wheels or larger only. Direct bolt-on. Accepts OEM HD brakes (1? rotor). Use factory ball joints & Tie Rod ends. Maintains factory geometry & alignment. Maintains factory ride quality. Powdercoated high strength ductile iron castings. Includes step by step installation instructions. Lower center of gravity for increased handling. Can be combined with lowering spring, air bags or coilovers for a more aggressive drop.