Do I need to replace all 4 struts at once?

Not necessarily. You typically replace the struts that are worn or leaking, but for even handling many drivers replace the pair on the same axle (front or rear) and sometimes all four if the suspension has seen broad wear.

How struts wear and how replacement choices are made

Understanding how struts wear helps explain why mechanics might suggest replacing one, a pair, or all four. Struts on the same axle tend to wear at similar rates, and the damping characteristics of new vs. old units can affect handling and ride balance. The decision often depends on the vehicle’s mileage, driving conditions, and whether the other struts are near end-of-life.

• Axe-by-axe wear: If both front struts show signs of wear or leakage, replace the pair on that axle.


• Symmetry for balance: If one strut on an axle is failing, many technicians replace the corresponding strut on the opposite side to restore even damping on that axle.


• High mileage or broad wear: With substantial mileage or when multiple struts are near fatigue, replacing all four can restore uniform ride height and handling.


• Performance and safety goals: For improved handling, stability, and tire wear control, replacing in pairs or all four is common on many cars.


• Budget considerations: If budget is tight, replacing two struts now and planning for the rest later is possible, but expect more complex handling consequences until the rest are done.

Bottom line: replacing in pairs is a widespread compromise between cost and performance, but all-four replacement is the clearest path to uniform damping and predictable handling when multiple units are worn.

Signs that your struts may be worn

erkening a strut problem early can prevent bigger suspension issues. Look for the following indicators which often prompt a replacement decision.

• Oil or hydraulic fluid leaks around the strut body.


• Excessive bouncing or a rough ride after hitting bumps.


• Increased front-end dive when braking or noticeable body roll in corners.


• Tire wear that looks cupped or uneven across the tread.


• Clunks, knocking noises, or squeaks over potholes and rough roads.


• Steering instability or pulling to one side on uneven surfaces.


• Visible sag on one corner or uneven ride height.

If you notice several of these signs, have the suspension inspected. A professional assessment will determine whether struts, mounts, or related components need replacement and what combination makes the most sense for your vehicle.

Costs, timing, and maintenance considerations

Costs can vary widely by vehicle and region, but the following ranges give a practical sense of what to expect. The breakdown below helps you plan whether you should replace one, two, or all four struts at once.

• Parts: A single strut assembly can range roughly from $150 to $450 for aftermarket parts, and higher for OEM or performance units. Replacing all four could total $600 to $1,800 in parts alone.


• Labor: Labor costs typically run $100 to $300 per strut, depending on vehicle design and local shop rates. Four struts could add $400 to $1,200 in labor.


• Total replacement cost: Expect roughly $800 to $2,500 for the full four-strut job, including parts and labor. Doing only two struts usually costs about half that, plus alignment.


• Additional parts and considerations: Some vehicles require new mounts, bearings, or the coil springs if the struts are integrated assemblies. In many cases the springs aren’t replaced separately unless a specific issue warrants it.


• Alignment and checks: An alignment is almost always needed after strut work to ensure proper steering and tire wear. A test drive is recommended to verify proper operation.

Prices vary by car type, whether you choose aftermarket or OEM parts, and local labor rates. Expect extra costs if you need an alignment, mount replacement, or other related components.

What to expect after replacement

Replacing struts changes the dynamic feel of the vehicle. Here’s what most drivers experience and what to plan for.

• Immediate change: The ride should feel firmer and more controlled, with reduced wallowing in corners or over bumps compared with worn struts.


• Alignment and inspection: A professional alignment will ensure proper tire wear and steering response; inspect tires for wear patterns and ensure no leaks remain.


• Test drive: A brief test drive helps confirm that the handling is balanced on straightaways and during cornering, with no unusual noises.


• Maintenance follow-up: Keep an eye on tire wear and regular suspension inspections, especially if your driving conditions are harsh or if you notice any new symptoms.

Proper installation and follow-up maintenance are essential to maximize the benefits of strut replacement and to ensure long-term stability and safety.

Summary

In most cases you don’t have to replace all four struts at once. Replacing worn struts on a single axle or in pairs is common practice to restore balance and handling, while replacing all four is often the best path for uniform damping on vehicles with high mileage or broadly worn suspension. Signs of wear, costs, and the need for an alignment should guide your decision. A professional inspection will help determine the optimal replacement plan for your car and driving style.

How long does it take to replace all four shocks and struts?

The time it takes to replace shocks and struts depends on your vehicle's type and the mechanic's experience level. Generally, it takes about two to four hours to replace four shock absorbers, with struts usually taking about an hour longer.

Do you always replace shocks in pairs?

Shocks and struts should always be replaced or installed in pairs. Since both the left and right shocks or struts are exposed to the same amount of wear and tear, it's usually recommended to replace both at the same time Routine maintenance is an effective way to prevent premature problems.

Do I need to do an alignment after replacing struts?

Yes, you almost always need an alignment after replacing front struts because the process can change the suspension geometry, affecting the camber and toe angles. Even if the struts don't have adjustment slots, the new components can alter the ride height and, therefore, the wheel alignment. 
This video explains how replacing struts can affect your car's alignment: 51sEricTheCarGuyYouTube · Jan 15, 2016
Why an alignment is necessary

• Alters suspension geometry: Replacing struts changes how the suspension is positioned, which can affect the wheel angles that determine alignment. 
• Changes ride height: New springs in the strut assembly can change the vehicle's ride height, which will throw off the alignment. 
• Impacts handling and safety: An alignment ensures the tires are positioned correctly, which is crucial for proper steering, braking, and preventing uneven tire wear. 
• Ensures performance: A proper alignment allows the new components to perform as they were designed, maximizing the benefits of the new struts. 

This video explains why you need an alignment after replacing suspension components like struts: 52sOne Trick TechnicianYouTube · May 3, 2025
When alignment is critical

• Front struts: Replacing front struts almost always requires an alignment check because they are structural components that significantly affect alignment angles. 
• Aftermarket parts: It is especially important to get an alignment after installing aftermarket suspension parts, as they can have different dimensions or weights than the original parts. 
• After any suspension work: It is best practice to get an alignment any time you replace suspension components, including control arms, ball joints, or tie rods, as it can have a ripple effect on the entire alignment. 

This video explains why you need an alignment after installing aftermarket suspension parts: 55sRacelandYouTube · Jul 21, 2023
How to know if you need an alignment

• Consult the vehicle's service manual: Some vehicle designs might have different requirements, so it's always a good idea to check the manufacturer's recommendations. 
• Look for signs of misalignment: Even if an alignment was performed, watch for signs such as a car pulling to one side, the steering wheel not being straight, or uneven tire wear. 

Is it okay to change only one strut?

While you can replace just one strut, it is highly recommended to replace them in pairs (both front or both rear) to ensure balanced handling and prevent uneven tire wear. Replacing a single strut can cause handling abnormalities because the new one will have different damping properties than the old one, leading to an uneven feel when driving over bumps or making turns. 
This video explains common mistakes when installing struts and why replacing both is recommended: 39s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Jun 2, 2021
Reasons to replace in pairs

• Balanced handling: Struts are designed to work together to keep your car stable. Replacing only one can create an imbalance, leading to unpredictable handling. 
• Even tire wear: A mismatched pair of struts can cause uneven tire wear over time. 
• Prevent premature failure: If one strut has failed, the other on the same axle is likely close to failing as well, as they are exposed to the same wear and tear. 
• Consistent ride height: Replacing both struts maintains the same ride height from side to side. 

When replacing a single strut might be considered

• New vehicle: If the car is very new and only one strut was damaged (for example, by hitting a curb or pothole), the other might not be worn out yet. 
• Intention to replace the second soon: If you plan to replace the second strut shortly after, it may be an option, but this is less cost-effective in the long run.