NOLATHANE Control Arm Kit - Lower

A lower control arm kit brings together what a single lower corner repair needs, whether that is a complete assembly ready to bolt in or the bushings and hardware to rebuild what you have.

The lower arm is the one that does the most work on almost every vehicle, and it is also the one carrying the most attached components, which is worth understanding before deciding what to order.

What a Lower Control Arm Carries Besides the Wheel

Most people think of the arm as a simple link between chassis and hub. On the lower position it is usually doing considerably more than that.

On a strut suspension the lower arm is the only arm, so it handles all the wheel positioning on its own and carries the lower ball joint. On a double wishbone design the spring frequently sits in a seat formed into the lower arm, which means the arm carries vehicle weight continuously rather than just locating the wheel.

Then there are the attachments hanging off it, because a great many lower arms carry the sway bar link mounting point, and some carry the lower shock or strut mount as well. Each of those is a hole in the arm with a fastener through it, and each is a place that can wear.

That matters when you are trying to diagnose a noise, because a worn sway bar link mounting hole on the arm produces a knock that sounds exactly like a worn bushing, and no amount of new bushings will fix it. If the link bolt has been loose or the hole has elongated, the arm itself needs replacing regardless of what else is serviceable.

Check those secondary mounting points whenever the arm is off. They are easy to overlook and they decide whether a rebuild is worth attempting.

How to Tell Whether the Lower Arm or Something Attached to It Has Failed

Because the lower arm carries so much, a noise coming from that corner can have several sources, and telling them apart before ordering saves money.

Start with the arm itself, levering it against its inboard mounts and watch for movement at the bushing rather than flex in the arm. That confirms or clears the bushings in about a minute.

Then check the ball joint separately by rocking the wheel top to bottom with the suspension unloaded. Play there is the joint, not the bushings, and the two feel quite different once you have seen both.

Next, put a hand on the sway bar link where it attaches to the arm and try to move it. Any play in that mounting point produces a sharp knock over bumps that mimics bushing wear closely enough to fool most people.

Finally, look at the spring seat if the design has one. Corrosion around the seat is common on older vehicles and it weakens exactly the part of the arm carrying the most load.

Working through those four in order takes ten minutes and tells you whether you need a lower control arm bushing kit, a ball joint, a link, or a complete assembly. Ordering before checking is how people end up with parts they did not need and a noise that is still there.

Why Lower Control Arm Kits Usually Include the Ball Joint

More often than not, a lower control arm assembly arrives with the ball joint already fitted, and there is a practical reason for it.

The lower control arm ball joint is the loaded joint on most vehicles, carrying weight while the hub steers and the suspension travels. It works harder than the upper joint and fails sooner. Manufacturers know this, which is why a great many lower arms have the joint pressed or riveted in rather than bolted, on the basis that the arm and joint will reach the end of their lives together.

That design decision is what makes the complete assembly the default repair on so many applications. Replacing a riveted lower joint means drilling rivets out from underneath the vehicle, and pressing one out means a hydraulic press and the right tooling.

Where the joint does bolt in, bare arms are offered and a lower control arm bushing kit becomes a legitimate option on its own. The listing tells you which situation you are in.

Front Lower and Rear Lower Control Arm Kits

The two positions do different jobs and the kits reflect that.

A front lower control arm assembly deals with steering, braking and, on most layouts, vehicle weight. It takes the heaviest loads on the vehicle and it is the position most commonly replaced.

Rear lower control arms on an independent rear end set camber and hold the hub against cornering load. They see less braking force and more constant lateral load, so they tend to fail through bushing wear rather than ball joint failure. Rear kits frequently group several links together, because the subframe access is the same whether you replace one or four.

An upper and lower control arm kit covers both positions on a double wishbone corner, which is the efficient way to do it when both are due, since separating the ball joints and supporting the suspension happens once either way.

Lower Control Arm Bushing Kit or Complete Assembly

The decision comes down to what you find once the arm is off the vehicle.

Rebuilding with a bushing kit is sound when the arm is straight, the mounting eyes are round, any secondary mounting holes are unworn, and the ball joint is either bolt-in or still tight. On a forged arm in good condition it is the cheaper route and the arm will outlast the new bushings.

A complete assembly is the answer when the eye has worn out of round, when the sway bar link or shock mounting hole has elongated, when corrosion has thinned a stamped steel arm, or when the ball joint is not separately serviceable.

Labor is nearly identical either way, since the arm comes off for both. That is why the gap between the two options is usually smaller in practice than the parts prices suggest.

The Lower Control Arm Bolt Kit Most People Forget

Worth ordering alongside whatever else you buy, particularly on an older vehicle.

The long bolt passing through the inboard bushing spends its life inside a damp crush tube. It seizes, and when it does it has to be cut out, which destroys the bushing and occasionally damages the arm on the way. Some manufacturers also specify these as single-use fasteners that stretch when torqued and should not be reused.

A lower control arm bolt kit costs very little next to the rest of the job, and it turns a potential three hour problem into a straightforward one. Check the service information for your vehicle, and where it does not specify, replacing the bolts on a high mileage vehicle is cheap insurance.

Lower Control Arm Replacement Cost

Lower control arm replacement cost is dominated by access rather than parts, which explains why quotes for the same vehicle vary so widely.

The arm comes off whichever route you take, and an alignment goes on the end regardless. What changes the number is whether the joint is riveted, whether the fasteners come out cleanly, and whether the shop has quoted a rebuild or a complete assembly.

Doing both sides at one visit avoids paying for the teardown twice, and replacing bushings while the arm is already off for a ball joint adds very little.

If you are comparing quotes, ask what happens if a bolt seizes and whether the alignment is included. Those two answers account for most of the variation.

Torquing a Lower Control Arm Assembly at Ride Height

Support the vehicle properly and take the spring load off before separating the ball joint, since a joint under load releases suddenly.

On designs where the spring seats in the lower arm, the spring is under compression while the arm is still attached. Release that carefully with the correct equipment rather than relying on the jack, because a spring leaving a seat unexpectedly is genuinely dangerous.

Use a proper ball joint separator rather than a hammer.

Torque the inboard fasteners with the vehicle sitting on its wheels at ride height rather than hanging on a lift. A bushing settles into the position it is clamped in, so one tightened at full droop stays twisted at normal ride height and binds from the first mile.

Fit a new cotter pin to the castle nut, refit the sway bar link to the arm, and book the alignment for the same visit.

Find Lower Control Arm Kits for Your Vehicle

Replacing the top arm as well? Upper control arm kits sit alongside these in the Nolathane control arm kit selection.

Select your vehicle to see the lower control arm kits listed for it, including complete assemblies, bushing kits and the hardware that goes with them. Every Nolathane component is backed by our warranty, a fitment guarantee and 60 day returns.