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2019-21 Silverado/Sierra 1500 BDS Upper control arm kit, fits with 6 inch lift or AT4 with 4 inch lift, Due to premature upper control arm ball joint wear being witnessed by our dealer network on stock, leveled, and lifted 2019-2021 GM 1500 trucks (including AT4 & Trail Boss), BDS Suspension highly recommends 121253 upper control arms Features: High strength 1.5" DOM tubular construction with gusseted ball joint housing Indexed ball joint cup offers more suspension travel on leveled/lifted applications Greaseable ball joint provides quiet operation and superior corrosion resistance Fully assembled, ready to bolt in right out of the box Optional weld-on steering stops and wheel spacer supplied for use with factory wheels Product Notes: Will NOT work for stock height vehicles or 4" IFS lift kits for standard GM1500 models. Will NOT with Denali models with ARC. Will work with Trail Boss/AT4 4" IFS lift kits. Will work with most leveling and 6" lift kits on the market. 5.5" max backspacing when used with the stock steering knuckles. Due to premature upper control arm ball joint wear on 2019+ GM 1500 trucks (including AT4 & TrailBoss), BDS Suspension highly recommends 121253 upper control arms to be purchased with this lift system.