Rockworx set a modified radius-arm suspension in place of the deleted leaf springs. On a side note, the leaf springs had replaced the original Toyota IFS A-arm system. The driver-side radius arm eliminates axle twist via the short link between the main arm and the upper axle bracket. The passenger-side link locates the axle front-to-rear but does not control axle twist. This system flexes like mad - all the better to conquer the trails with.