Product information updated on 2021-08-25, Manufactured by BellTech - Part Number Belltech 2511, 2007-16 Silverado/Sierra 1500 2wd 2 inch lowering spindles (See fitment notes), Only with cast steel control arms. 2 inch Drop Spindle, must use at least 17 inch wheels. Fits: 07-16.5 GM Silverado/Sierra 1500 2WD 07-14 GM Tahoe/Yukon/Escalade/Denali 2WD 07-13 GM Suburban/Yukon XL/Avalanche 2WD (NOTE: Spindle designed only to be used in conjunction with lowering spring or lowering strut resulting in proper alignment specs) Belltech lists as 2wd only, our updates say 2 or 4 wheel drive only, designed to work with minimum of 3 inch drop, Since 1983 Belltech engineers developed one of the industry firsts that enabled the Sport Truck craze, the Belltech Drop Spindle. By relocating the wheel mounting point a.k.a. spindle pin higher on the spindle casting, our engineers were able to provide a 2-3” lowering without affecting any other suspension or steering geometry, not even the shock absorber! Belltech Drop Spindles offer a 2 or 3 inch drop depending on the application, while improving handling and retaining factory ride quality. Belltech spindles maintain critical suspension geometry and eliminate excessive ball joint, shock and tire wear common to other methods of lowering. Each spindle is built from OEM grade high strength ductile iron, providing the structural integrity to meet and exceed all factory specifications & requirements.