UMI rear coilover kit – 150lb street springUMIs bolt in rear coilover bracket kit is a complete mounting solution for your Quick Performance axle in your 1978 1988 GM G Body. This bracket features a multi position design to allow further fine tuning of ride height and shock location. In addition to shock location adjustability, the UMI 3054 features five positions of trailing arm location adjustment to match the Quick Performance adjustable lower control arm brackets. Minor drilling is