Control Arms are one of the most common parts that get beefed up on a Jeep, especially when you’ve lifted it, or plan to really put it to work on the trails... Their primary function is to control the up and down movement of the suspension when you're on the roads or driving over terrain. Basically any time the suspension is moving.

What does a Control Arm do? 

A Control Arms primary function is to control the up and down movement of the suspension when you're on the roads or driving over the terrain. Basically any time the suspension is moving.

Control Arms are one of the most common parts that get beefed up on a Jeep, especially when you’ve lifted the Jeep, or plan to really put it to work on the trails.

Jeep JK Wrangler front control arms (there are two of them) will connect from the frame or unibody of the Jeep, up to the differential housing (or a bracket on the housing).

Types of Control Arms

There are two basic kinds of Control Arms that are used. One is a “fixed” position arm, where the end is affixed to the tube portion or an “adjustable” arm where the end can rotate for a further adjustment, especially on lifted vehicles.

They can also determine (or alter) the wheelbase of your Jeep. The longer the arm for instance, the more the differential can be “pushed forward.” On a lifted Jeep, this can help keep the larger tires centered in the wheel well, for less chance of rubbing and interference. The wheelbase is the measurement from the center of the rear wheel to the center of the front wheel. Moving the differential forward or back changes that measurement.

Control Arms also affect the pitch/pinion angle of your differential. Getting the correct angle, especially on a lifted Jeep, is crucial to minimize vibration in your driveshaft and drivetrain. You know how a small vibration can suddenly become a big one? Checking out your Control Arms would be a good idea in a case like that.

On stock control arms, the bushings can go bad and get fatigued. So a visual inspection now and then is a good idea. If they need replacing, we carry plenty of alternative Control Arms for different kinds of Jeeps and different kinds of driving.

Note: there are arms on the back of some Jeeps as well, like a JK Wrangler, that do a similar job.