UMI Performance 78-88 GM G-Body 82-03 S10/S15 Front Lower A-arms Coilover OnlyUMIs 3057 1 lower a arms arms feature a relocated ball joint cup which offers 10 degrees caster when used with our P N 3056 upper arm while keeping the spindle pin centered. The 3 4 taller Howe ball joint works to optimize the roll center, lower the center of gravity and lowers the ride height . The double shear shock mount is removable which permits spring and shock changes at the track in minutes without disconnecting the ball joints. An aluminum