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REAR CONTROL ARM: Steering and Suspension Parts

A control arm is a bar that has a pivot at both ends.


Control Arm Shaft Kit

Most cars have several, including the upper control arm and the lower control arm, which are arranged to form the letter A. Control arms are key parts of the suspension system. They join suspension components to the chassis, and manage the motion of the wheels, synchronizing them with the body of the car. They work with bushings, which are cylindrical linings that reduce friction, and keep the auto parts from going every which way.

The rear control arm connects to the frame by a control arm shaft and or bushing. The arm spans out to the spindle or knuckle support and is connected with a ball joint or a pin and bushing. For many car or truck suspensions, the rear control arm works in unison with the lower control arm. This is called a double wishbone suspension.

Control arms typically house wearable suspension parts. The inner part of the upper control arm will attach to the frame by a shaft and or bushings. The outer end will have a replaceable ball joint or upper outer pin and steel bushing.