A Subaru Mechanic's Guide to the 2011-2019 Legacy Suspension Strut Mount
Hearing clunks, rattles, or pops from your front end? It might be your strut mounts.
- For 2015-2019 models, check for a steering rack TSB (#04-17-17R) before assuming a clunking noise is from the strut mount.
- KYB is a trusted aftermarket brand that provides OEM-level quality for your Legacy.
- Always replace strut mounts in pairs and perform a wheel alignment immediately after the service to prevent tire damage.
- This is not a beginner DIY job due to the need for a dangerous spring compressor; professional installation is recommended.
Is Your Legacy Making Noise Over Bumps?
One of the most common complaints from 2011-2019 Subaru Legacy owners is a clunking, rattling, or knocking sound from the front suspension. These noises are often most noticeable at low speeds when driving over small, sharp bumps or uneven pavement. While a worn 🎬 Watch: This guide helps you diagnose clunking noises over bumps. strut mount is a likely suspect, it's not the only cause.
STOP: Check This Before You Buy Parts
For 2015-2019 Legacy models, Subaru issued a Technical Service Bulletin (TSB #04-17-17R) for a clunking noise that is frequently misdiagnosed as a bad strut. The noise may actually come from the electronic power steering rack. The fix is a simple and inexpensive spring kit (Part No. 34130AL010) that a technician can install. Check for this TSB first, as it could save you hundreds of dollars in unnecessary strut repairs.
How to Choose the Right Aftermarket Strut Mount
When replacing a strut mount, you don't have to go back to the dealer. Aftermarket parts can offer the same quality for less money, but quality varies by brand. Here’s how the common brands stack up for your Legacy:
- Premium (OEM-Equivalent): Brands like KYB are often the original equipment manufacturer for Subaru. Choosing a KYB mount is the closest you can get to the original part's quality and ride feel. They are highly recommended by Subaru enthusiasts and mechanics for fit and durability.
- Standard (Good Value): Monroe is a well-known aftermarket brand that offers a solid balance of quality and price. While generally reliable, some professional installers and DIYers prefer the ride quality of KYB. A Monroe mount is a perfectly acceptable replacement for a daily driven vehicle.
- Economy (Budget-Focused): Brands like DEA and Westar are budget options. While they meet basic fitment requirements, they may use harder rubber compounds. This can lead to more noticeable vibration and a harsher ride compared to premium brands. They will fix the core problem of a failed mount but may compromise ride comfort.
Should I Replace the Whole Strut Assembly?
The strut mount is just one part of the larger strut assembly, which also includes the strut (shock absorber), coil spring, and boot. If your Legacy has over 80,000 miles, it is wise to consider replacing the entire assembly, often called a "Quick-Strut" or "loaded strut." This saves on labor time, replaces all wearable components at once, and is much safer than compressing the old spring. 🎬 See how to install a complete front strut and spring assembly. If only the mount has failed on a lower-mileage car, replacing just the mount is acceptable.
Estimated Replacement Costs
| Part | Cost (Per Part) |
|---|---|
| OEM Strut Mount | $90 - $150 |
| Aftermarket Strut Mount | $57 - $97 |
| Shop Labor (Per Side) | $150 - $300 |
Pro Tip: Cosmetic Rust vs. Real Problems
Many Legacy owners notice surface rust on the large nut on top of the strut mount when they open the hood. Subaru has released a TSB (#05-62-18R) confirming this is usually cosmetic and does not affect the part's safety or function. The fix is to install an updated, better-sealing dust cap (Part No. 20326FL001). Don't replace a strut mount for this reason alone.
Frequently Asked Questions (FAQ)
Do I need to get an alignment after replacing strut mounts?
Yes, absolutely. Replacing the front strut mounts requires removing the strut assembly, which directly affects your wheel alignment angles. You must get a professional four-wheel alignment immediately after the repair to prevent uneven tire wear and ensure proper handling.
Can I replace just one strut mount?
It is strongly recommended to replace strut mounts in pairs (both front or both rear). Suspension components wear at similar rates. If one has failed, the other is likely not far behind. Replacing them together ensures balanced handling and saves you from having to do the same job twice in the near future.
Is replacing a strut mount a DIY job?
This is an advanced DIY job. While removing the strut assembly is straightforward for a home mechanic, swapping the mount requires a tool called a spring compressor to safely handle the high-tension coil spring. Improper use of a spring compressor is extremely dangerous. Unless you are very experienced and have the proper tools, this job is best left to a professional mechanic.
🎬 Watch this walkthrough of the front strut replacement process.What's the difference between a strut mount and a strut bearing?
The strut mount is the entire component that bolts to the car. The strut bearing is a part inside the front strut mounts that allows them to pivot for steering. Often, a bad bearing is the cause of noises when turning the wheel. Most new strut mounts come with a new bearing already installed.
Helpful Videos
Technical Specifications
OEM Part Numbers: 20320AJ00A 20370AJ00A 20320AL00A 20370AL00A
Contains a rubber insulator and, for front applications, an integrated bearing for steering pivot. Attaches to the strut tower with three M8 or M10 nuts.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Legacy:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Legacy Making Noise Over Bumps?
- STOP: Check This Before You Buy Parts
- How to Choose the Right Aftermarket Strut Mount
- Should I Replace the Whole Strut Assembly?
- Estimated Replacement Costs
- Pro Tip: Cosmetic Rust vs. Real Problems
- Frequently Asked Questions (FAQ)
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