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If your Forester feels loose in corners, produces uneven tire wear, or gives clunking noises over bumps, replacing worn rear control arms can restore composure and safety. The right Subaru Forester rear control arm improves suspension geometry, reduces noise, and helps prevent premature tire wear while keeping alignment within spec.This guide shortlists seven rear control arms that suit common Forester repair and upgrade scenarios. We evaluated each option for fitment accuracy, bushing and joint durability, and how straightforward installation tends to be. Read on to find the option that best balances longevity, ride quality, and ease of fitment for your Forester.
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 | Detroit Axle Rear Upper Control Arms w/Ball Joints and Sway Bar End Links — 4pc Set |  |
| Best Quality Built to a higher standard if you want something more solid | Metrix Premium Chassis Parts Rear Left Upper Control Arm with Ball Joint |  |
| Best Value The sweet spot between price and what you get | A-Premium Rear Forward Lower Suspension Lateral Arms, Pack of 2 |  |
| Best Budget The cheapest option that still gets the job done reliably | Magimaker Rear Suspension Trailing Control Arm 20250-FL001 |  |
| Highest Rated A top-rated pick with lots of positive feedback | Detroit Axle Rear Upper Control Arms w/ Ball Joints (2pc) |  |
| Most Popular A crowd favorite that many people choose with confidence | Detroit Axle Rear Left Upper Control Arm with Ball Joint Assembly |  |
| Best Seller A high-volume bestseller chosen again and again | Detroit Axle Rear Right Upper Control Arm with Ball Joint Assembly (Passenger Side) |  |
1. Detroit Axle Rear Upper Control Arms w/Ball Joints and Sway Bar End Links — 4pc Set
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear Upper |
| Material Type | Alloy Steel |
| Manufacturer Part Number | 4CS48269 |
This Detroit Axle kit provides 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 typically used when worn control arms or end links cause clunking, uneven tire wear, or sloppy rear handling. The arms are made from a high-strength alloy and are described as corrosion resistant and impact-tested, which should translate to longer service life compared with basic aftermarket pieces. Direct-fit design aims to simplify installation and restore factory steering and suspension geometry without modifications. The included sway bar links let you replace common wear items at the same time so the whole rear suspension feels more composed. Limitations to keep in mind are that this is a vehicle-specific kit so compatibility is limited to the stated model years and the product listing does not include detailed torque specs or bushings material beyond general descriptions, so professional installation is recommended if you want exact alignment and longevity assurances.
Best for: Drivers wanting a balanced, value-oriented repair that restores rear suspension feel and handling on covered Subaru Forester or Crosstrek model years without extensive modification.
Less Ideal for: People seeking performance-tuned or track-oriented suspension upgrades or owners of vehicles outside the stated year ranges should look elsewhere.
- Complete four-piece kit replaces both rear upper control arms and sway bar end links for a one-stop repair
- High-strength alloy construction aimed at improved durability and rust resistance
- Direct-fit, vehicle-specific design simplifies installation and preserves factory geometry
- Includes ball joints preinstalled, reducing part-matching and installation steps
- Fitment limited to specific Subaru Forester and Crosstrek model years so not universal
- Listing lacks detailed material specs for bushings and torque values for install
Verdict: A practical, direct-fit four-piece rear suspension kit that refreshes handling and replaces common wear items on the covered Subaru Forester and Crosstrek model years.
2. Metrix Premium Chassis Parts Rear Left Upper Control Arm with Ball Joint
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear Left Upper |
| Auto Part Orientation | Drivers Side |
| Material Type | Steel |
| Manufacturer Warranty Description | 3 Year / 36,000 miles Limited Warranty |
This Metrix rear left upper control arm is a direct-fit replacement that pairs a steel control arm with an integrated pre-greased ball joint for Subaru Forester (2009-2013) and Outback (2010-2019). It installs like a factory-style unit to restore rear suspension geometry and handling after wear or damage. Notable features include a greasable design and corrosion-resistant coating that help extend service life while making routine maintenance easier. The steel construction and factory-style fit aim to preserve steering response and vehicle stability, which is important for drivers chasing sharper handling or replacing worn suspension parts to recover performance. The unit carries several equivalent part numbers for cross-reference and comes with a limited 3 year/36,000-mile warranty. Limitations are typical of a direct replacement: it restores factory performance but does not change suspension geometry or offer performance-tuned bushings for lowered or track-focused setups, and alignment is required after installation to prevent uneven tire wear.
Best for: Drivers who need a durable, factory-style rear control arm to restore handling and alignment after wear or damage and who prioritize reliable, maintenance-friendly replacements over aftermarket tuning.
Less Ideal for: Enthusiasts seeking a performance-tuned control arm to alter suspension geometry, reduce flex, or support lowered/track setups should consider specialty aftermarket options instead.
- Vehicle-specific fit that matches rear left upper position for a direct replacement
- Pre-greased ball joint and greasable design simplify maintenance and can extend service life
- Steel construction and corrosion-resistant coating provide durable, factory-quality strength
- Includes housing and matches common OEM equivalent part numbers for easier cross-referencing
- Does not provide performance-oriented geometry or upgraded bushings for lowered or track use
Verdict: A durable, factory-style rear left upper control arm that restores Subaru handling and is built for long service life and easy maintenance.
3. A-Premium Rear Forward Lower Suspension Lateral Arms, Pack of 2
| Position | Rear Lower |
|---|---|
| Material | Steel |
| Bushing Included | Yes |
| Ball Joint Included | Yes |
| Exterior | Corrosion-Resistant Coating |
These A-Premium rear forward lower lateral arms are a direct replacement suspension arm sold as a pack of two for the rear lower position. They arrive with pre-greased bushings and integral ball joints, so installation replaces both the arm and its wearable pivot points in one step. Built from steel with a corrosion-resistant coating, they are intended to address common rear-end symptoms such as clunking, steering wander, uneven tire wear, and vibration. Typical use is as a professional or DIY repair part when original rear lateral arms are worn or damaged; the included hardware mirrors factory connections so alignment disturbance is minimized when swapped. Practical benefits include ready-to-install bushings and ball joints plus protective coating for longer life in wet climates. Limitations are typical of aftermarket arms: fitment is vehicle-specific so confirm model-year compatibility, and these are replacement parts rather than performance uprated components for aggressive handling or track use.
Best for: Buyers seeking a practical, ready-to-install replacement to restore rear suspension function and eliminate clunks or wander on compatible Subaru models, with priority on cost-effective, OEM-style repairs.
Less Ideal for: Drivers wanting performance-tuned or heavy-duty suspension components for track or heavy off-road use should look at reinforced or performance-specific arms instead.
- Sold as a matched pair to replace both sides at once
- Includes pre-greased bushings and ball joints for faster installation
- Steel construction with corrosion-resistant coating for durability
- Direct-fit design targets common rear suspension symptoms to restore ride quality
- Designed as a factory-style replacement, not a performance or reinforced aftermarket upgrade
Verdict: A practical, ready-to-install pair of rear lower lateral arms that restore factory-style rear suspension function on compatible Subaru models.
4. Magimaker Rear Suspension Trailing Control Arm 20250-FL001
| Manufacturer Part Number | 20250-FL001 20250FL001 |
|---|---|
| Fit Type | Vehicle Specific Fit |
| Auto Part Position | Rear |
| Material Type | Metal |
This Magimaker rear trailing control arm is a direct-fit replacement for specific Subaru models and is intended to restore rear suspension alignment and control after wear or damage. It installs in place of the factory arm and is used when a broken bushing or bent arm is causing excess play, uneven tire wear, or alignment issues. The arm is metal construction and sold as a single rear unit with a manufacturer part number that matches the factory reference. Practical benefits include restoring correct rear suspension geometry and helping eliminate clunking or wandering at the rear axle without needing a full subframe job. Because it is a vehicle-specific fit, installation is straightforward for a competent DIYer or a local shop familiar with Subaru rear suspension. Limitations are the single-arm package and the need to verify the part number before purchase to ensure exact fitment for model year and trim variations.
Best for: Buyers looking for an affordable, direct replacement to fix rear suspension play or alignment on supported Subaru models who want a straightforward repair without modifying other suspension components.
Less Ideal for: Drivers seeking upgraded performance arms, adjustable geometry, or heavier-duty competition parts should look at aftermarket performance options instead.
- Vehicle-specific fitment for Subaru Crosstrek, Forester, and WRX model years listed
- Metal construction intended to match factory replacement strength
- Sold as a single direct replacement unit for rear trailing arm repairs
- Manufacturer part number matches the factory reference for easier verification
- Sold as one arm only so buyers replacing both sides must purchase two units
Verdict: A budget-friendly, factory-replacement style rear trailing arm to restore proper rear suspension function on the specified Subaru models.
5. Detroit Axle Rear Upper Control Arms w/ Ball Joints (2pc)
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear |
| Manufacturer Part Number | K623523_K623524 |
| Manufacturer Warranty Description | 10-Year |
This Detroit Axle kit supplies both rear upper control arms with preinstalled ball joints as a direct replacement for compatible Subaru Forester and Crosstrek models. Designed as a vehicle-specific fit, the arms arrive ready to bolt in and restore rear suspension geometry after wear or damage. Detroit Axle highlights premium alloy construction and reinforced structure to resist corrosion and repeated impact loads, which should translate to steadier handling and longer service life compared with worn factory arms. Installation is straightforward for a competent DIYer or shop because the assemblies come complete rather than requiring separate ball joint installation. The main limitations are that the parts are unfinished (paint or coating may be needed for extra corrosion protection) and the listing covers specific model years only, so confirm exact fit before ordering. Backed by a long manufacturer warranty, this kit is aimed at buyers who prioritize dependable, factory-quality replacement over performance upgrades.
Best for: Buyers who want a dependable, factory-style replacement to restore rear suspension alignment and handling on a Forester or Crosstrek and value long-term reliability over aftermarket performance tuning.
Less Ideal for: Shoppers looking for upgraded performance arms with adjustable geometry or finished/coated parts ready for harsh climates should consider performance-oriented alternatives.
- Includes both left and right rear upper control arms with ball joints for a complete rear-side replacement
- Vehicle-specific direct-fit design reduces installation time and need for modifications
- Premium alloy construction and reinforced structure for improved durability and impact resistance
- Comes with a 10-year manufacturer warranty indicating long-term support
- Finish is listed as unfinished, so additional corrosion protection may be needed for long-term exposure
Verdict: Choose this kit when you need a durable, ready-to-install rear upper control arm replacement that restores factory-style reliability for the Forester/Crosstrek rear suspension.
6. Detroit Axle Rear Left Upper Control Arm with Ball Joint Assembly
| Fit Type | Vehicle Specific Fit |
|---|---|
| Auto Part Position | Rear Left Upper |
| Material Type | Alloy Steel |
| Manufacturer Warranty Description | 10-Year |
This Detroit Axle rear left upper control arm with integrated ball joint is a direct-fit replacement intended for select Subaru Forester and Crosstrek/Crosstrek XV years. It replaces the factory rear upper control arm on the driver side and is typically used when a worn arm, torn bushing, or failed ball joint is causing noise, looseness, or uneven tire wear. Built from alloy steel with a reinforced structure, the arm is sold as a single complete assembly to simplify installation and avoid pressing in a new ball joint. That makes it practical for DIY mechanics and shops wanting a one-part swap. The description highlights corrosion resistance and higher rigidity for longer service life, and Detroit Axle claims factory-quality fit and durability backed by impact and fatigue testing. Limitations are that this is a vehicle-specific part so correct year and side must be confirmed before ordering and it comes as a single arm rather than a paired kit, so replacing both sides requires a second purchase.
Best for: Buyers who prioritize proven fit and straightforward installation and who want a replacement backed by lots of customer feedback and a long warranty for peace of mind.
Less Ideal for: Those who prefer to replace suspension components in matched pairs by default or who need a universal or multi-vehicle part for multiple car projects.
- Direct-fit, single-piece assembly with integrated ball joint simplifies installation and avoids ball joint transfer work
- Made from alloy steel with reinforced structure for improved wear resistance and impact durability
- Sold specifically for rear left upper position which reduces fitment confusion for supported Subaru models
- Supplied as a single arm rather than a matched pair so both sides require separate purchases if dual replacement is desired
Verdict: Choose this direct-fit Detroit Axle rear upper control arm if you want a ready-to-install, factory-quality replacement with robust construction and strong customer acceptance for select Subaru Forester and Crosstrek models.
7. 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 rear upper arm and includes a preinstalled ball joint to simplify installation. Designed as a vehicle-specific fit for 2014–2020 Forester and select Crosstrek years, it functions as a direct replacement to restore proper suspension geometry and steering response after wear or damage. The arm is made from alloy steel with a reinforced structure aimed at resisting impact and corrosion, and Detroit Axle states the part undergoes durability testing. For a risk-averse buyer the preassembled ball joint and vehicle-specific design reduce fitment and installation uncertainty, and the included 10-year warranty adds assurance. Expect straightforward bolt-on replacement for typical DIY or shop installation, though the unit is unfinished so it may show raw metal until painted or coated. Also this is a single passenger-side arm; buyers needing both sides or a full rear suspension refresh should plan accordingly.
Best for: Buyers seeking a reliable, ready-to-install replacement to restore factory suspension behavior with minimal fitment risk and a long warranty-backed lifespan.
Less Ideal for: Anyone looking for a cosmetically finished part or a complete rear suspension kit; also not for buyers who need both left and right arms in one purchase.
- Vehicle-specific direct-fit design reduces guesswork during installation
- Preinstalled ball joint simplifies replacement and saves labor time
- Alloy steel construction with reinforced structure for improved durability
- Backed by a long 10-year warranty for added owner confidence
- Sold as a single passenger-side arm so you may need to purchase the matching side separately
Verdict: Choose this Detroit Axle passenger-side rear upper control arm if you want a tested, vehicle-specific, preassembled replacement that minimizes fitment and installation risk.
Choosing the Right Subaru Forester Rear Control Arm: Key Factors to Consider
Fitment and Compatibility
Correct fitment is essential because even small differences in mounting point location, length, or bushing offset can change wheel alignment and handling. Use arms that explicitly match the Foresters rear suspension mounting pattern and intended model years or configurations to avoid unexpected toe or camber changes.
A properly fitting arm will bolt into place without modification and preserve factory roll center and scrub radius. If fitment data is unclear, you may face added labor to adapt mounts or correct alignment, which increases total repair time and cost.
Bushing Material and Design
Bushings determine how the control arm transmits forces and isolates noise. Softer rubber bushings typically deliver quieter ride and better isolation, which helps for daily driving. Stiffer polyurethane bushings increase lateral control and responsiveness but can transmit more noise and vibration into the cabin.
Consider the tradeoff between comfort and handling for your driving needs. Also check whether bushings are pressed in or serviceable; replaceable bushings can reduce future maintenance expense. Quality bushing construction helps resist control arm bushing wear and premature failure from salt and road contaminants.
Joint Construction and Durability
Where the arm connects to the hub or subframe, joints and ball studs must handle repeated loads. Durable ball joint designs with robust seals and corrosion-resistant finishes extend service life and reduce likelihood of control arm ball joint failure.
Evaluate whether joints are bonded, crimped, or serviceable. Serviceable joints or ones designed for easy replacement can make future repairs simpler. A stronger joint construction also reduces the chance of clunking or handling vagueness as components age.
Material and Corrosion Resistance
Control arms are exposed to salt, water, and road debris, so materials and coatings matter. Steel arms with proper galvanization or powder coating resist rust better than bare steel. Cast or forged components can be strong but vary in susceptibility to corrosion based on finish.
For Foresters that see winter roads or coastal environments, prioritize corrosion-resistant finishes. Rust can compromise mounting points and make future removal difficult, increasing labor and part replacement costs.
Installation and Serviceability
Some rear control arms install with common hand tools and reuse factory hardware, while others require presses, alignment fixtures, or specialized tools. An arm that facilitates straightforward control arm installation reduces shop time and overall repair expense.
Also consider whether the design allows future servicing of bushings or joints. Replaceable components can lengthen the useful life of the control arm and reduce long-term ownership costs.
Impact On Alignment And Handling
Even when an arm fits, its geometry and bushing compliance influence toe and camber behavior under load. Arms that maintain correct geometry help prevent alignment issues and uneven tire wear. Stiffer components reduce deflection but can make alignment more critical during installation.
Plan for a post-installation alignment check. If you frequently carry heavy loads or tow, choose an arm that preserves alignment under those conditions to avoid recurring control arm alignment issues.
When To Replace Rear Control Arms On A Forester
Rear control arms wear gradually, and symptoms can overlap with other suspension faults. Common indicators include clunking or knocking from the rear over bumps, a loose or wandering feel in corners, and uneven tire wear across the tread. Those control arm symptoms often point to worn bushings or ball joints.
If you notice these signs, inspect the bushings for cracks, split rubber, or excessive movement. Checking for play at the ball joint or excessive corrosion at mounting points can confirm the need for replacement. Replacing arms before critical failure preserves handling and avoids more costly downstream damage to tires or alignment.
- Clunking noise over bumps or during acceleration and braking
- Visible bushing cracking or separated rubber
- Excessive rear wheel toe movement under load
- Rusted or seized mounting hardware preventing smooth pivoting
Selecting Between Replacement And Upgrade Options
For routine repairs, a direct-fit replacement that matches factory geometry and bushing characteristics is often the best choice. That keeps steering and alignment behavior consistent with the vehicles original design and minimizes additional setup work.
If you are pursuing improved handling or durability, consider upgraded arms with firmer bushings or enhanced joint construction. Keep in mind that performance-oriented choices may increase cabin noise or require more frequent alignment checks.
- Direct-fit for like-for-like restoration of handling
- Stiffer or reinforced arms for reduced deflection and better lateral control
- Serviceable designs when long-term maintenance economy is a priority
Preparing For Installation
Before beginning a control arm installation, gather the necessary tools and inspect rear suspension components. Required tools commonly include a jack and stands, torque wrench, breaker bar, and appropriate sockets. For pressed-in bushings or ball joints, a press or specialized tool may be required.
Plan for an alignment after installation. Even with perfect fitment, replacing control arms typically alters camber or toe enough to require professional alignment. Also inspect adjacent components such as sway bar links and shocks, since worn items there can affect perceived control arm performance.
- Have replacement hardware and thread locker available if needed
- Use jack stands on stable ground and follow safety procedures
- Expect a post-installation wheel alignment
Minimizing Common Installation Pitfalls
A frequent mistake is reusing severely corroded bolts or mounting hardware. Corroded fasteners can fail during final torque or complicate future removals. If hardware shows significant rust or thread damage, replace it with equal-grade replacements.
Another pitfall is tightening bushings with the suspension loaded incorrectly. Many control arms require final torque with the vehicle at normal ride height to prevent preloading bushings. Consult service procedures for torque sequence and whether the arm should be tightened with suspension compressed or at ride height.
- Replace rusted hardware rather than risk reuse
- Follow manufacturer torque specs and tightening sequence
- Consider professional help if bushings are pressed or the job requires special tools
How Arm Choice Affects Long-Term Maintenance
Arms with replaceable bushings or rebuildable joints reduce lifetime cost because worn components can be refreshed without full arm replacement. This is particularly useful for high-mileage Foresters where bushings commonly deteriorate over time.
Conversely, low-cost sealed arms may serve well initially but could necessitate full-arm replacement sooner. Factor in access to tools and skill level when choosing between serviceable and sealed designs.
- Serviceable designs can lower long-term ownership costs
- Sealed units are simpler to install but may need full replacement later
- Environment and driving style influence expected maintenance intervals
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 Rear Control Arm
We focused on the attributes that matter most when choosing a rear control arm for a Subaru Forester. Fitment accuracy was primary; control arms must match factory mounting points and tolerances to maintain suspension geometry. Durability came next, with attention to bushing material, joint construction, and corrosion resistance since those influence long-term service life on varied road conditions.Ride and handling impact was assessed by looking at how arm design and bushing stiffness affect lateral control and NVH. Installation friendliness was considered, including whether the arm uses serviceable bushings, requires special tools, or needs additional alignment work. We also weighed long-term serviceability such as replaceable bushings or rebuildable ball joints.Exclusions: we excluded options that lack clear fitment data for the Forester, use unverified materials, or rely on proprietary mounting changes that alter suspension geometry. Final selections balance authentic fitment, durability, and practical installation characteristics appropriate for routine repair or modest performance upgrades.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the most common control arm symptoms on a Subaru Forester?
Common symptoms include clunking or knocking from the rear over bumps, increased play or wandering in cornering, and uneven tire wear. These signs often indicate worn bushings or ball joints rather than unrelated driveline issues.
Can I replace rear control arms myself with basic tools?
You can replace many rear control arms with basic tools if the bushings and joints are serviceable and bolts are accessible. However, pressed-in components or seized hardware may require a press or specialized tools, and a post-installation alignment is typically necessary.
How soon should I get an alignment after installing new rear control arms?
You should schedule an alignment immediately after installation. Even correctly fitting arms can change toe and camber, and driving without alignment risks uneven tire wear and compromised handling.
Does replacing rear control arms fix uneven tire wear?
Replacing worn arms can correct the suspension geometry that contributes to uneven tire wear, particularly when bushing deterioration allows excessive toe change. A follow-up alignment is important to fully resolve wear patterns.
How does bushing choice affect ride and handling?
Softer rubber bushings tend to isolate road noise and provide a more comfortable ride, while firmer polyurethane or solid bushings reduce deflection and improve responsiveness. The right choice depends on whether you prioritize comfort or sharper handling.
Are there specific signs that the control arm ball joint is failing?
Signs include lateral play at the joint, clunking during directional changes, or a loose feeling when driving over irregular surfaces. Visual inspection for torn seals or grease leakage also suggests ball joint wear.
Final Verdict
When selecting rear control arms for a Subaru Forester, prioritize correct fitment, quality bushing construction, and durable joint design. Those three elements most directly influence handling, NVH, and long-term reliability. Installation ease and corrosion resistance are important secondary considerations based on your environment and mechanical ability.Decide whether you want a like-for-like replacement to restore factory behavior or an upgraded design for firmer handling and extended durability. Regardless of choice, plan for a professional alignment after installation and inspect adjacent suspension parts to ensure the overall system performs as intended.
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