4Pcs Adjustable HD Front Control Arms 0-6" Lift for Dodge Ram 1994-2009 3500 34827451Introduction The control arms are perpendicular to the axis of the vehicle, in automotive suspension, a control arm is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel. Control arms allow wheels to move up and down while preventing forward and rearward movement. They are typically equipped with bushings on the frame side of the vehicle and a ball joint on the wheel side of the vehicle that allow