The Ultimate Buyer's Guide for Forester XT Rear Shocks Springs

If your Subaru Forester XT has started to sag in the rear, feels bouncy on the highway, or makes unsettling knocking noises over bumps, you are not alone. A comprehensive survey of automotive repair data suggests that shock absorbers and springs on vehicles in this age range are well beyond their typical service life, with many failing between the 60,000 to 90,000-mile mark. This guide will walk you through diagnosing the issue, exploring all your replacement options, and choosing the perfect Forester XT rear suspension upgrade for your needs and budget.

What Are the Symptoms of Bad Rear Shocks on a Subaru Forester?

Your Forester's rear suspension is a symphony of components working in harmony. When the rear shocks or springs wear out, the music stops. Here is how to tell if your rear struts are bad.

The Saggy Rear End

The most classic sign, especially on Foresters used for hauling gear or towing, is a noticeable sag in the rear. The car may look like it is squatting. This is a clear indicator the springs have lost their tension.

Excessive Bouncing

Push down firmly on the rear bumper and release. A healthy suspension will return to its normal position and stop. If the car continues to bounce two or three times, the rear shock absorbers are no longer effectively damping the spring's energy.

Poor Ride Quality and Handling

You might experience a floaty, unstable feeling at highway speeds, especially when crossing bridges or in windy conditions. Body roll during cornering will become more pronounced, and the rear end may feel skittish.

Knocking or Clunking Noises

Worn-out internal valves in the shock or a completely blown shock can cause a metal-on-metal knocking sound. This is often a sign that the rear strut assembly is in dire need of replacement.

Uneven Tire Wear

Failed suspension cannot keep the tires planted firmly on the road, leading to cupping or scalloping wear patterns on the tread.

Your Replacement Options: From Stock to Heavy-Duty

Once you have diagnosed the problem, the next step is choosing the right path forward. Your choice depends on your budget, intended use for the vehicle, and mechanical aptitude.

OEM (Original Equipment Manufacturer) Replacement

OEM parts are made by the original supplier to Subaru. Choosing OEM means you are getting the exact same part that came on your car from the factory. This is the best choice for owners who want to restore the original ride quality and handling characteristics without any modifications. For a Subaru Forester rear shock replacement, this is the benchmark.

Quick Struts / Complete Assemblies

A Forester XT rear strut assembly is a complete, pre-assembled unit. It includes a new shock, a new spring, a new strut mount, and a new bump stop, all compressed and ready to bolt in. This is a fantastic option for DIYers as it eliminates the need for dangerous spring compressors and makes the job significantly easier and safer. Brands like Monroe and Gabriel offer these.

Performance Upgrades (KYB, Bilstein)

This is where you can truly transform your Forester. Performance shocks like the KYB Forester XT rear struts (Excel-G) are gas-charged for better damping and control than stock. The legendary Bilstein B6 Forester application offers even more performance, with monotube design providing exceptional heat dissipation and consistent performance during spirited driving or towing. This is a core part of a true Forester rear suspension upgrade.

Lift Kits and Heavy-Duty Springs

For the adventurers, a 1-2 inch lift kit can provide crucial ground clearance. These kits often include spacers and new, taller springs. Alternatively, if your sag is due to constant heavy loads or towing, heavy-duty springs from brands like King Springs or RalliTEK will correct the height and prevent future sag, effectively providing a Forester XT rear suspension sag fix.

Compatibility: Navigating SG (2003-2008) vs. SH (2009-2013) Forester XT Models

This is a critical step before purchasing. While both generations share the Forester XT name, their suspension architectures have key differences.

SG Forester XT (2003-2008): This generation uses a traditional strut-type suspension in the rear. The top of the strut bolts directly into the strut tower in the wheel well. When searching for SG Forester XT rear springs, note that they are specific to this chassis.

SH Forester XT (2009-2013): Subaru changed the rear suspension to a multi-link, double-wishbone setup for improved handling. The shock and spring are separate components. The shock absorber bolts in separately from the spring. This is a vital distinction, as the parts are not interchangeable between SG and SH models.

Are Forester XT and non-XT rear suspension parts the same? Generally, no. The XT model typically has slightly stiffer spring rates and different damping characteristics to handle the additional weight and performance of the turbocharged engine. Always verify part numbers for your specific model and year.

Key Buying Considerations: Cost, Use Case, and DIY

Choosing the right parts is a balance of several factors. Ask yourself these questions before clicking "add to cart."

Intended Use: Daily Driver, Performer, or Adventurer?

• Daily Driver: Prioritize comfort, reliability, and value. OEM or quality aftermarket quick struts are ideal.
• Performance-Oriented: You want less body roll and sharper handling. Focus on performance shocks like Bilstein or KYB Gas-a-Just.
• Off-Road/Towing: Your goal is capability. Look for heavy-duty springs or a complete lift kit to correct sag and add height.

DIY Difficulty and Safety

Replacing a pre-assembled rear strut assembly is a moderately difficult DIY job. It requires basic hand tools, jack stands, and torque wrenches. The most dangerous part of replacing individual components is using spring compressors. If you are not 100% confident, opt for quick struts or leave the job to a professional. Your safety is paramount.

Brand Reliability and Cost

You often get what you pay for. Budget-friendly options may save money upfront but wear out quicker. Established brands like KYB, Bilstein, and OEM offer proven durability and performance. Consider the total cost of ownership, not just the initial purchase price.

Specific Product Recommendations

Based on different use cases and budgets, here are our top picks for the best rear shocks for Forester XT.

Best OEM Replacement: KYB Excel-G

KYB is actually an OEM supplier for many Japanese automakers, including Subaru. The Excel-G line is designed to meet or exceed the original equipment specifications. It is the perfect choice for the owner who wants that factory-fresh ride without the factory-fresh price tag. This is a direct fit for both SG and SH models (as separate components for SH).

Best Performance Upgrade: Bilstein B6

The Bilstein B6 Forester shock absorber is a monotube performance shock renowned for its exceptional damping control. It reduces body roll, improves cornering stability, and handles heavy loads and towing with ease. It is the go-to choice for the enthusiast who demands the best. Pair them with OEM or aftermarket springs for a sublime setup.

Best for Sag Correction and Towing: RalliTEK Heavy-Duty Springs

If your Forester's rear end is dragging, RalliTEK springs are the answer. They are specifically designed to increase rear ride height and load capacity, making them the ultimate Forester XT towing suspension upgrade. They provide about an inch of lift and a firmer, more controlled ride when loaded.

Best Value & Easiest Installation: Monroe Quick-Strut Assembly

For the cost-conscious DIYer, the Monroe Quick-Strut is a complete, ready-to-bolt-in solution. It eliminates all the guesswork and danger of spring compression. While not a performance part, it will restore your ride to a safe, comfortable state for a very reasonable price.

DIY Installation Overview: What to Expect

While a full step-by-step guide is beyond this article's scope, here is a high-level overview of a Subaru Forester rear shock replacement on an SG model with quick struts.

1. Safety First: Park on a level surface, engage the parking brake, and chock the front wheels. Loosen the rear lug nuts before lifting the car.
2. Lift and Support: Jack up the rear of the car and support it securely on jack stands. Remove the rear wheels.
3. Remove the Old Strut: From inside the trunk, remove the trim covering the top of the strut tower. Unbolt the (3) 12mm nuts holding the top of the strut. Then, unbolt the (2) 17mm or 19mm bolts at the bottom of the strut where it connects to the hub.
4. Install the New Strut: Maneuver the new quick strut into place. Hand-thread the top nuts and the bottom bolts. Once everything is started, torque the top nuts to spec (typically around 40-50 ft-lbs) and the bottom bolts to spec (typically 110-130 ft-lbs).
5. Reassemble: Put the wheel back on, lower the car, and torque the lug nuts to specification. Repeat on the other side.
6. Alignment: It is highly recommended to get a wheel alignment after replacing suspension components to ensure proper tire wear and handling.

How difficult is it? For a seasoned DIYer, this is a 2-3 hour job. For a first-timer, it may take a weekend. The right tools and patience are key.

Frequently Asked Questions (FAQ)

How long do Forester rear shocks typically last?

On a Subaru Forester, rear shocks and springs typically last between 60,000 and 100,000 miles. However, driving habits, road conditions, and vehicle loading can significantly shorten this lifespan.

Can I replace just the rear shock and not the spring?

Yes, but it is often not recommended. If the shock is worn out, the spring is likely also fatigued and has lost some of its tension. For a balanced repair and optimal performance, replacing both simultaneously is the best practice. This is why quick struts are a popular choice.

How much does it cost to replace rear struts on a Forester XT?

Parts alone can range from $250 for a budget-minded DIY job using quick struts to over $600 for high-performance components. If having a professional do the work, expect to pay between $800 and $1,500 for parts and labor for both rear sides.

Will upgrading my rear suspension improve towing capacity?

No, upgrading the suspension will not change the manufacturer's stated maximum towing capacity. However, it will significantly improve the vehicle's ability to handle that maximum capacity by preventing sag, reducing bounce, and improving stability, making towing safer and more comfortable.

What's the difference between a shock absorber and a strut?

A shock absorber is a standalone component that dampens motion. A strut is a major structural part of the suspension system that incorporates a shock absorber into its assembly. The SG Forester uses a rear strut assembly, while the SH Forester uses a separate shock and spring setup.

Recommended Resources and Next Steps

Ready to tackle your Forester XT rear shocks springs replacement? For genuine OEM parts and trusted performance upgrades, visit our suspension department at Genuine Subie Parts. We carry everything you need to get your Forester riding like new again.

For more diagnostic tips, check out our detailed guide on Symptoms of Bad Shocks and Struts.