Control Arm Kit - Upper with Fitting Position Front

An upper control arm holds the top of the steering knuckle while the lower arm holds the bottom, and between them they set camber and caster. The upper arm also carries the upper ball joint that lets the knuckle pivot when you steer.

People arrive here for two very different reasons. Either the arm has worn out and needs replacing, or the truck has been lifted and the alignment can no longer be brought back.

The Arm That Follows Rather Than Carries

Not every vehicle has one, because on a strut suspension the strut locates the top of the knuckle and there is no upper arm at all. Where a vehicle does use one, the layout is a double wishbone, and the upper and lower control arms work together to control how camber changes as the suspension travels, which is why it shows up on trucks, performance cars and most solid front axle designs.

The upper arm carries less vertical load than the lower on most of those designs, because the spring usually sits on the lower arm. What it does carry is the sideways and twisting load that comes from cornering, braking and steering, and all of it is fed through a ball joint that is typically smaller than the one underneath.

That combination explains a lot about how these fail. An upper control arm, or upper A arm depending on whose catalog you are reading, can be worn out while the lower arm on the same corner is perfectly serviceable, and the wear tends to concentrate in the joint rather than spreading across the bushings.

Some truck designs reverse the arrangement entirely, putting the spring or torsion bar on the upper arm, which makes the upper the loaded arm and changes which one you should be inspecting first.

Why Lifting a Truck Puts the Upper Arm at the Top of the List

Raising a truck changes camber and caster the moment the suspension settles, because the arms swing through a different part of their arc than the engineers designed them around.

Caster is what most people notice first, and it washes off as the geometry rotates, and caster is what makes the steering settle and return to center, so losing it produces a truck that wanders at highway speed, needs constant small corrections, and feels lazy turning in. Camber moves at the same time, which is what starts wearing the inside or outside edge of a new set of tires.

Factory upper control arms have very little adjustment designed into them, and on most trucks whatever there was has already been consumed before the lift went in. The alignment shop will tell you the numbers are out of range. They will not be able to do anything about it, because there is nothing left to move.

An arm with correction designed into its geometry physically repositions the top of the knuckle, which hands the aligner range that simply did not exist before. That is the reason aftermarket upper control arms exist as a category rather than as a repair part.

The Ball Joint Problem That Comes With Lift

There is a second issue that gets far less attention than the alignment, and it is often what actually fails.

A factory upper ball joint is designed around factory suspension travel. Lift the truck and the arm sits at a steeper angle through its entire range, so at full droop the joint is being asked to articulate further than it was ever built to. What follows is predictable enough: the joint binds at the extreme of travel, the boot stretches and tears, and once the boot is gone the grease washes out and contamination gets in.

That is why people fit a lift and then find themselves replacing upper ball joints every year or two, blaming parts quality for something that is really a geometry problem.

Purpose built arms address both at once, restoring the alignment range while using a joint with the articulation a raised truck actually demands. On a truck that sees washboard roads, ruts or real articulation, that matters more day to day than the numbers on the alignment printout.

Fixed Offset Against Adjustable

Fixed offset and tubular upper control arms have the correction built into the shape of the arm, so they are correct the moment they are bolted in, nothing can shift or work loose afterward, and there is nothing to check at the next service. For a truck at a known lift height that gets used hard, that reliability is usually worth more than the alternative.

Adjustable upper control arms let the setting be dialed in on the alignment rack and allow each side to be set differently, which matters on a truck that has settled unevenly or pulls to one side once tires and pressures have been ruled out. They also leave you room to change ride height later without buying arms a second time.

Either way, check the lift range the arm was engineered around. These are designed for a band rather than for anything, and an arm built for a two to four inch lift fitted to something considerably taller will move the geometry in a direction you did not ask for.

Bushings, Ball Joint or the Whole Arm

Worth diagnosing properly before ordering, because the cheapest option is sometimes the right one.

Upper control arm bushings on their own make sense when the ball joint is still tight, the arm is straight and the ride height has not changed. Fresh bushings remove the deflection that lets the arm move under load and stop the geometry wandering while you drive, and offset camber adjustable bushing kits will even give you a degree of correction without changing the arm at all.

The complete arm is the answer when the joint has gone as well, when the arm is bent or corroded, when a mounting eye has worn oval and will no longer hold a bushing, or when you need correction that the factory never provided.

There is a practical argument on top of that. Pressing bushings and ball joints out of an upper arm takes a press, correct diameter tooling and a fair amount of time, and the risk of damaging the arm in the process is real. A complete arm arrives assembled and turns the whole thing into a bolt-in job.

What a Bad Upper Control Arm Feels Like

• Clunking or knocking from the front over bumps, often worse at low speed
• A knock or shudder that comes through the steering wheel
• Steering that wanders and needs constant correction, worse as speed rises
• Uneven tire wear across one edge that keeps returning after every alignment
• Play at the ball joint when the wheel is rocked with the suspension unloaded
• A split or torn ball joint boot, or grease thrown around the wheel arch
• Upper ball joints failing repeatedly since a lift was fitted
• Cracked, split or squeezed out material in the upper control arm bushings
• Caster reading low on an alignment printout with nothing worn to explain it
• An alignment the shop cannot bring into specification at all

Bad upper control arm symptoms overlap with the lower arm and with worn tie rods, so the useful distinction is where the play shows up. Rock the wheel top to bottom for a ball joint, side to side for a tie rod end, and pry the arm against its mount for the bushings.

Why Quotes Differ on the Same Job

Upper control arm replacement cost is driven by labor and by what is being fitted rather than by the price of an arm.

The arm comes off the truck whichever route you take, and an alignment goes on the end of the job regardless, since replacing an upper arm changes camber and caster immediately. Those two costs are fixed no matter what goes between them.

What changes the number is whether you are fitting a straight replacement or a correction arm, whether both sides are being done, and whether the shop has quoted the alignment as part of the job or as an extra. A correction arm costs more as a part and exactly the same to fit, which is why doing it once properly usually beats fitting a replacement now and a correction arm later.

Separators, Torque at Ride Height and the Alignment After

Upper arms bolt into the factory mounting locations and arrive assembled, so this is a remove and replace job rather than press work.

Support the truck properly and take the load off the suspension before separating the ball joint, because a joint under spring load releases suddenly and without any warning. Use a proper separator rather than a hammer, which damages the knuckle bore and the stud threads.

Fit both sides, because a corrected arm working against a factory one gives you two different geometries and an alignment nobody can balance between them.

Torque the inner fasteners with the truck on its wheels at ride height rather than hanging at full droop, since the bushings sit preloaded in a position the suspension never returns to and will bind from the first mile.

Cycle the suspension through full travel before calling it finished, checking clearance against the coil, the strut and the tire at both extremes of travel. Then book the alignment for the same visit, because the entire purpose of a corrected arm is to give the aligner range and driving away unaligned wastes the exercise.

Find Upper Control Arms for Your Vehicle

Upper kits belong to our wider control arm kit lineup.

Select your vehicle to see the upper control arms and bushing kits available for it, and check each listing for the correction it provides and the lift range it was designed around. Every Whiteline component is backed by our warranty, a fitment guarantee and 60 day returns.