Last updated 2021-01-20, BDS Suspension , BDS:121253 , 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 , 2019+ GM 1500 BDS Upper control arm kit ,