4. We'll add some additional gussets to the control arm mounting points at the axle cradle later. We bolted the control arms in place to make sure the suspension geometry was proper. The triangulated four-link improves how the suspension works in all kinds of driving conditions and controls the axle without restricting articulation. The lower arms keep the pinion at a constant angle and reduce axlewrap. The upper two control arms keep the axle centered so a track/Panhard bar isn't needed.