Shackles are a vital part of a leaf sprung suspension. Flexing of the elliptically-shaped leaves changes the straight line distance between the spring pack's mounting eyes. A shackle is placed at one ...

Leaf springs are pretty common on custom 4x4s, even though coil and coilover combinations are becoming quite popular. Coils and coilovers can be tempting, but don't sell the old-fashioned leaf-spring ...