Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If your Subaru Forester feels loose, wanders, or shows uneven tire wear, the upper control arm can be a common source of the problem. Replacing worn or damaged upper control arms restores proper suspension geometry, improves steering response, and extends tire life for Forester owners.This guide presents the six shortlisted upper control arms that suit the Subaru Forester. We explain the practical reasons each option made the list and walk through the fitment, durability, and installation considerations you should weigh when choosing. Read on to compare the products and learn which features matter most for reliable on-road performance.
Looking for other parts? See all Subaru Forester parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | A-Premium Rear Upper Control Arm with Ball Joint and Bushing (pair) |  |
| Best Quality Built to a higher standard if you want something more solid | MAC (Mevotech) Rear Upper Control Arms with Ball Joints for Subaru Forester 2008–2013 |  |
| Best Value The sweet spot between price and what you get | Detroit Axle Rear Upper Control Arms with Ball Joints and Sway Bar End Links — 4pc Kit |  |
| Best Budget The cheapest option that still gets the job done reliably | Detroit Axle Rear Right Upper Control Arm with Ball Joint Assembly (Passenger Side) |  |
| Most Popular A crowd favorite that many people choose with confidence | Detroit Axle Rear Left Upper Control Arm with Ball Joint Assembly (Driver Side) |  |
| Best Seller A high-volume bestseller chosen again and again | Detroit Axle Rear Upper Control Arms w/ Ball Joints (2pc) for Subaru Forester/Crosstrek |  |
1. A-Premium Rear Upper Control Arm with Ball Joint and Bushing (pair)
| Position | Rear Upper |
|---|---|
| Includes | Ball Joint and Bushing |
| Material | Steel |
| Exterior | Corrosion-Resistant Coating |
These rear upper control arms are a direct-style replacement for select Subaru Forester and Crosstrek models and come as a pair with ball joints and bushings pre-installed and pre-greased. They are intended to resolve common suspension issues such as clunking over bumps, steering wander, uneven tire wear, and excessive vibration by restoring proper rear suspension geometry. Constructed from steel with a corrosion-resistant coating, the arms include the necessary hardware to swap into the rear upper position on driver and passenger sides. Installation is the same as a standard control-arm replacement and is suited to a DIY with basic tools or a professional shop for alignment afterward. The practical benefits are immediate noise reduction and improved steering feel once worn components are replaced, and the included ball joints remove the need to press in new joints. Limitations are that these are vehicle-specific fit replacements rather than upgraded performance arms and will require a wheel alignment after installation to avoid tire wear.
Best for: Buyers seeking a practical, factory-style replacement to stop rear-end clunking and restore stock suspension feel on a Subaru without upgrading suspension geometry.
Less Ideal for: Drivers who want strengthened or adjustable control arms for performance suspension tuning should look at aftermarket performance options instead.
- Includes pre-installed ball joints and bushings for a straightforward swap
- Corrosion-resistant coating to help resist road rust
- Pre-greased components reduce initial break-in noise and simplify installation
- Supplied as a left and right pair to replace both rear upper arms at once
- Designed as a factory-style replacement and not a strengthened performance upgrade
Verdict: Buy this pair if you need a ready-to-install, factory-style rear upper control arm replacement that restores stock ride quality and eliminates clunking.
2. MAC (Mevotech) Rear Upper Control Arms with Ball Joints for Subaru Forester 2008–2013
| Compatible models | Subaru Forester 2008-2013; Subaru Outback 2010-2019 |
|---|---|
| Includes | Left and right rear upper control arm assemblies with bushings and ball joints |
| Manufacturer | Mac Auto Parts (MAC) |
These rear upper control arms replace the factory rear upper links and come as a pair with preinstalled bushings and ball joints, letting you swap both sides without pressing parts. They are built to factory-quality fit and function and are intended for direct replacement on compatible Subaru Forester models; installation follows the same mounting points as the original parts. Preassembled ball joints and bushings reduce install time and cut the need for special presses, and the components are inspected to meet fit and durability expectations typical of ISO-certified manufacturing. For a performance-oriented Forester, these arms restore proper rear suspension geometry and steering feel after wear or damage, helping maintain predictable handling. Limitations are that the parts aim to match factory characteristics rather than upgrade stiffness or reduce deflection for heavy-duty or track-focused builds, and any alignment or hardware beyond the arm itself is not included.
Best for: Buyers who want a reliable, ready-to-install rear upper control arm replacement to restore handling and suspension geometry on a Forester used for daily driving and spirited road use.
Less Ideal for: Drivers seeking an aftermarket performance arm with increased stiffness, adjustable geometry, or track-focused components should consider purpose-built performance arms instead.
- Sold as a matched left and right pair for one-step replacement
- Preinstalled bushings and ball joints reduce installation time and need for special tools
- Manufactured in ISO-certified facilities to meet fit and function expectations
- Inspected assemblies intended to restore factory suspension geometry and handling
- Designed to match factory characteristics rather than provide a stiffer, performance-tuned upgrade
Verdict: A convenient, factory-quality pair of rear upper control arms with preinstalled ball joints that restores proper rear suspension behavior on 2008–2013 Foresters.
3. Detroit Axle Rear Upper Control Arms with Ball Joints and Sway Bar End Links — 4pc Kit
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear Upper |
| Material Type | Alloy Steel |
| Manufacturer Part Number | 4CS48269 |
This Detroit Axle kit supplies two rear upper control arms with integrated ball joints plus two rear sway bar end links as a direct-fit replacement for specified Subaru Forester and Crosstrek years. It is intended for straightforward suspension repair or refresh jobs where the factory rear upper arms and links are worn or damaged. The control arms are made from alloy steel with a high-strength structure and corrosion-resistant finish, and the company rates the parts for improved durability under repeated impact loads. The integrated ball joints simplify reassembly and the sway bar links round out rear suspension wear items in one purchase, which reduces labor compared with sourcing parts separately. Installation is typical for rear upper arm replacement and should be within the scope of a competent DIY mechanic or a shop familiar with Subaru suspension work. Limitations include vehicle-year fitment—this kit targets specific Forester and Crosstrek model years—so verify fit before buying, and buyers needing upgraded performance rather than like-for-like replacement should consider purpose-built performance arms.
Best for: Buyers who want a practical, single-purchase solution to replace worn rear upper arms and sway bar links on specified Subaru Forester or Crosstrek models and prefer durable, factory-style components that simplify installation.
Less Ideal for: Shoppers seeking high-performance suspension upgrades, custom geometry, or parts for vehicles outside the listed Forester and Crosstrek years should look elsewhere.
- Complete four-piece kit replaces both rear upper control arms and rear sway bar end links in one purchase
- Alloy steel construction and reinforced structure designed for wear resistance and corrosion protection
- Integrated ball joints simplify assembly and reduce the number of separate parts to install
- Designed as vehicle-specific direct-fit replacements to streamline installation
- Fitment is limited to specific Subaru Forester and Crosstrek model years and must be checked before purchase
- Not intended as a performance upgrade; engineered as a factory-style replacement
Verdict: A convenient, factory-style four-piece rear suspension kit that replaces worn rear upper control arms and sway bar links on the specified Subaru Forester and Crosstrek model years.
4. Detroit Axle Rear Right Upper Control Arm with Ball Joint Assembly (Passenger Side)
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear, Upper |
| Auto Part Orientation | Passengers Side |
| Material Type | Alloy Steel |
This Detroit Axle rear right upper control arm replaces the passenger-side assembly on compatible Forester and Crosstrek models and comes with a preinstalled ball joint for a straightforward swap. It is a direct-fit, vehicle-specific part intended for use where the original arm is worn, damaged, or the ball joint has excessive play. Made from alloy steel with a reinforced structure, the arm resists corrosion and repeated impact loads that occur in everyday driving and light off-road use. Installation is typical for rear suspension work but is simplified by the ready-to-install ball joint, which reduces bench-pressing and alignment of components during fitment. The part is backed by a long warranty and aims to match factory fit and function at a lower cost than dealer parts. Limitations are that it is a single passenger-side arm sold alone and finished in unfinished steel, so buyers wanting matched pairs, painted finishes, or upgraded performance bushings will need other options.
Best for: A buyer looking to restore factory steering and rear suspension geometry on a budget who prefers a ready-to-install replacement that keeps repair time and complexity down.
Less Ideal for: Shoppers who want a painted or cosmetic finish, a matched pair, or upgraded performance bushings should consider alternatives or additional purchases.
- Direct-fit, vehicle-specific design for easier installation
- Integrated ball joint reduces additional parts and simplifies replacement
- Alloy steel construction with reinforced structure for durability
- Backed by an extended 10-year warranty indicating long-term support
- Sold as a single passenger-side arm rather than a matched pair
Verdict: Choose this part if you need an affordable, direct-fit passenger-side rear upper control arm with an integrated ball joint to quickly restore factory handling.
5. Detroit Axle Rear Left Upper Control Arm with Ball Joint Assembly (Driver Side)
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear Left Upper |
| Auto Part Orientation | Drivers Side |
| Material Type | Alloy Steel |
This Detroit Axle rear left upper control arm is a direct-fit replacement that swaps into the factory location on supported Subaru Forester and Crosstrek models. It comes as a single driver-side assembly with an integrated ball joint, so installers can replace a worn arm and joint in one step without pressing parts apart. The part is made from alloy steel and is described as having enhanced structural strength and corrosion resistance, which should help it hold up against repeated road impacts and salt exposure. Typical use is a routine suspension repair when you have play in the rear upper arm or a failing ball joint; a competent DIYer with basic suspension tools or any independent shop can install it. The practical benefits are simple: faster install compared with separate-arm-and-joint repairs, factory-style fitment, and a 10-year warranty for added peace of mind. Limitations are that this is a single-arm driver-side unit so you need to buy the passenger side separately for a full-axle refresh, and it follows factory geometry rather than performance tuning for lowered or modified vehicles.
Best for: Buyers who prioritize a factory-style, worry-minimizing replacement backed by long-term warranty and social proof from other owners, and who want a straightforward repair that restores original suspension geometry.
Less Ideal for: People building lowered, lifted, or otherwise modified Foresters seeking performance-tuned or adjustable control arms should consider specialty aftermarket options instead.
- Direct-fit, vehicle-specific design simplifies installation and reduces alignment surprises
- Integrated ball joint included so the arm and joint are replaced together
- Made from alloy steel with a high-strength structure to resist impact and corrosion
- Backed by a 10-year warranty for longer-term confidence
- Sold as a single driver-side unit, so matching passenger-side purchase is required for both sides
Verdict: A durable, direct-fit rear left upper control arm with integrated ball joint and long warranty that restores factory suspension performance on supported Subaru Forester and Crosstrek models.
6. Detroit Axle Rear Upper Control Arms w/ Ball Joints (2pc) for Subaru Forester/Crosstrek
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear |
| Part Interchange Info | X623523 X623524 |
| Manufacturer Warranty Description | 10-Year |
This Detroit Axle kit replaces both rear upper control arms and includes pre-assembled ball joints for a straightforward swap on compatible Subaru Forester and Crosstrek years. It is sold as a vehicle-specific direct-fit replacement intended to match factory mounting points, which makes it suitable for routine suspension repairs and restoring original geometry after wear. The arms are cast from a premium alloy with a reinforced structure to resist impact and corrosion, and the included ball joints remove the need to press in new joints during installation. Practical benefits include easier installation for DIYers or independent shops and a design aimed at long service life backed by a long warranty. Limitations are that the parts are offered unfinished and may require painting or corrosion protection depending on local conditions, and fitment is limited to the listed Subaru years and models so you must confirm exact vehicle compatibility before buying.
Best for: Buyers who want a reliable, factory-style replacement that minimizes installation complexity and prioritizes long-term durability and peace of mind.
Less Ideal for: Drivers seeking upgraded performance parts or altered suspension geometry for off-road or tuned applications should consider performance-focused alternatives.
- Direct-fit, vehicle-specific design simplifies installation and restores factory geometry
- Includes pre-assembled ball joints so no joint press work is needed
- Premium alloy construction and reinforced structure for improved durability
- Backed by a long 10-year warranty for added buyer confidence
- Supplied unfinished so may need protective coating to resist corrosion in harsh climates
Verdict: A confidence-building, direct-fit replacement kit that makes restoring rear suspension function on the specified Subaru Forester and Crosstrek quick and dependable.
Choosing the Right Subaru Forester Upper Control Arm: Key Factors to Consider
Fitment and Compatibility
Correct fitment is the single most important factor for a Subaru Forester upper control arm. An arm designed for the Forester will match the vehicle's mounting points, ball-joint angle, and arm length so suspension geometry remains within factory tolerances.
Improper fitment can lead to premature wear, abnormal tire wear, and unsafe handling. Confirming bolt pattern, bushing orientation, and any model-year notes ensures the replacement integrates with the stock knuckle and frame without adapter plates or frame modification. Fit also affects whether the arm preserves factory alignment settings or requires additional adjustments after install.
Bushing Design and Material
Bushings control how the control arm isolates noise and transmits loads to the chassis. For Forester use, consider whether the arm uses rubber, polyurethane, or serviceable insert bushings. Rubber bushings provide quieter operation and better NVH isolation but can degrade faster under heavy use and moisture exposure.
Polyurethane or multi-piece designs sacrifice some compliance for improved responsiveness and longer service life, which can benefit owners who carry loads or tow. Replaceable bushing designs let you refresh the interface later without replacing the entire arm, reducing long-term ownership cost.
Ball Joint Quality
The ball joint links the upper control arm to the steering knuckle and is critical for steering precision. Look for ball joints with sealed boots, corrosion-resistant seats, and tight tolerances to reduce play. A loose or deteriorated ball joint produces steering wander, uneven tire wear, and clunks over bumps.
Some arms feature serviceable ball joints that can be greased, extending life. For Forester owners, a robust ball joint helps maintain alignment under side loads encountered during cornering or rough roads.
Strength and Construction
Upper control arms experience tensile and bending loads; construction quality determines how they handle repeated stresses. Forged or heavy-gauge stamped steel arms with reinforced mounting areas resist deformation better than thin-plate designs.
Weld quality, gussets at stress points, and protective finishes against corrosion all contribute to longevity. A sturdier arm reduces the risk of fatigue failure and keeps suspension geometry consistent over time, which is especially important in regions with rough roads or winter salt exposure.
Alignment and Adjustability
Some upper control arms offer alignment adjustment or are built to maintain factory alignment settings. Adjustable designs make it easier to correct camber and caster after installation, which is useful if other suspension components are worn or if the new arm changes geometry slightly.
Non-adjustable arms should preserve factory geometry as delivered. Plan to check alignment after replacement since even correctly fitting arms can shift settings slightly during installation. Proper alignment prevents uneven tire wear and preserves steering feel.
Ease Of Installation And Serviceability
Installation considerations matter for owners doing their own work or for independent shops. Look for arms with accessible mounting points, standard hardware requirements, and clear instructions. Arms that allow grease fittings or have replaceable components simplify maintenance.
Time-saving features such as pre-assembled bushings, captive nuts, or provision for common tools reduce labor and lower the chance of installation errors. Also consider whether the arm requires special alignment procedures or additional parts such as replacement bolts.
When To Replace Your Forester Upper Control Arm
Upper control arms typically show symptoms before catastrophic failure, so timely replacement preserves safety and prevents secondary damage. Watch for signs like steering looseness, uneven tire wear concentrated at the inner or outer edges, clunking noises over bumps, or visible bushing cracking. Regular inspections during oil changes or tire rotations help catch bushing wear and corrosion early.
- Inner or outer tire feathering near the front axle
- Clunking or knocking noises when going over bumps
- Steering wander or increased free play in the wheel
- Visible rust, bent arm, or cracked bushings on inspection
Diagnosing Control Arm Problems On A Forester
Start with a visual inspection of the arm, bushings, and ball joint boots. Look for torn rubber, missing grease, rust at the pivot points, or play at the ball joint. A simple hands-on check is to lift the front of the vehicle and grasp the tire at 12 and 6 o'clock to check for vertical play; excessive movement can indicate ball-joint wear.
- Check bushing rubber for cracks or separation
- Inspect ball joint boot for tears or grease leakage
- Measure wheel runout and compare tire wear patterns to target alignment specs
Preparing For Control Arm Installation
Before you begin, gather the necessary tools, a torque wrench, jack stands, and any replacement hardware specified for the Forester. Have alignment tools or a plan to get a professional alignment after install. If the replacement arm includes grease fittings, have a grease gun ready to service the joint after mounting.
- Use factory torque specs for all suspension fasteners
- Replace hardware if bolts show stretch or corrosion
- Mark current alignment settings or take photos to help during reassembly
Maintenance Tips To Extend Arm Life
Regular visual checks and periodic greasing where applicable will lengthen service life. Keep pivot areas free of road grime and inspect for corrosion, especially in regions with road salt. If you detect early bushing deterioration, consider replacing bushings or the arm before ball-joint damage occurs.
- Clean pivot areas and apply corrosion inhibitors sparingly
- Service grease fittings at recommended intervals if present
- Address alignment issues promptly to avoid uneven bushing loading
Still looking for the perfect fit?
Select your Subaru Forester configuration to see the most relevant Control Arms recommendations
How We Chose the Best Subaru Forester Upper Control Arm
We evaluated candidates using criteria that reflect real-world Forester ownership and typical failure modes. Fitment and compatibility were top priorities: each arm was required to match Subaru Forester suspension mounting points and orientations without modification for the relevant model years. Materials and corrosion protection were assessed, with preference for steel or forged components and durable finishes that resist road salt and moisture.Durability under load was judged by bushing design and ball-joint construction. We favored arms that use replaceable or serviceable bushings, robust ball joints with dust protection, and thicker mounting flanges where applicable. Alignment stability and adjustment capability were considered to ensure the arm can maintain caster and camber settings after installation.Ease of installation and serviceability mattered for owners doing DIY work: clear bolt patterns, accessible grease fittings, and compatibility with common replacement hardware were included as positive factors. We excluded arms that required frame modification, nonstandard adapters, or undocumented fitment claims. Cost-effectiveness and parts support rounded out the criteria, emphasizing long-term reliability over short-term savings.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I tell if the upper control arm is bad on my Forester?
Often symptoms include steering wander, clunking over bumps, and inner or outer edge tire wear. A physical inspection for torn bushings or play in the ball joint usually confirms the diagnosis.
Can I replace just the bushings instead of the whole upper control arm?
Sometimes bushings are replaceable, and that can be a cost-effective option if the arm and ball joint are in good shape. However, if the arm shows corrosion, bending, or the ball joint is worn, replacing the entire arm is typically safer and more durable.
Will replacing the upper control arm fix alignment issues?
Replacing a worn arm can restore geometry, but an alignment check is usually necessary afterward. If other suspension components are worn, additional adjustments may be required to achieve correct camber and caster.
Is upper control arm installation difficult for a DIYer?
Difficulty depends on tools and experience. The mechanical steps are straightforward, but working under the vehicle, torquing fasteners to spec, and getting a proper alignment are important. Many owners choose to have an alignment performed after a DIY install.
How long do upper control arms typically last on a Forester?
Service life varies with driving conditions, mileage, and environment. In normal driving conditions, arms often last many years, but exposure to rough roads or road salt shortens life. Regular inspection helps spot wear before failure.
What causes upper control arm bushing wear on a Forester?
Bushing wear comes from repeated flexing, exposure to moisture and salts, and heavy loads. Misalignment and worn complementary components can increase stress on bushings and accelerate deterioration.
Final Verdict
Choose an upper control arm that matches Forester fitment, prioritizes robust ball-joint construction, and uses durable bushing designs. Consider whether adjustability or replaceable bushings matters for your maintenance strategy and whether you will do the installation yourself or rely on a shop.Balancing strength, corrosion protection, and serviceability leads to the best long-term outcome. After installation, always verify alignment and inspect the surrounding suspension for wear to ensure the replacement delivers the expected handling and tire-life benefits.
Explore More:
- Check out all Subaru Forester parts & accessories
- Explore Control Arms Maintenance & Repair Guides
- Explore Suspension & Steering
- Browse all Auto Parts
