For Lexington drivers deciding whether to replace struts in pairs, the usual recommendation is to replace both on the affected axle when wear is the reason for repair. That means the left and right front struts, or the left and right rear struts. It does not automatically mean replacing all four.
Replacing only one may be reasonable after isolated damage if the opposite strut is still in good condition, a compatible replacement is available, and the applicable manufacturer guidance supports that repair. The recommendation should explain those findings rather than rely only on which side looks worse.
Why is replacing both usually recommended?
A strut helps control suspension movement. Putting a fresh unit opposite a worn one can leave different damping characteristics across the axle. Monroe recommends paired replacement, and notes that wear develops gradually; the other strut may be worn even before it shows an obvious problem. Monroe’s paired-replacement guidance explains that reasoning.
The inspection should compare both existing struts with the proposed replacement. Ask what the inspection found on the companion side and whether the two struts have the same replacement history.
For a clear explanation, ask the technician to separate the reason the first strut needs replacement from the reason the opposite one is included. For example, “this side is leaking” explains the first part of the recommendation. The explanation for the other side should address its condition, its history, or whether it can be matched to the new part. Those are useful details to have on the estimate.
When could replacing one strut make sense?
I-CAR says shocks and struts should be replaced in pairs when the undamaged companion is aged, worn, or cannot be matched. The condition of the opposite strut and the availability of a match therefore matter. See I-CAR’s suspension-parts guidance.
Consider a recently replaced pair where one unit later suffers isolated damage. A single replacement could be considered if the companion passes inspection and the replacement matches. This is a conditional application of I-CAR’s criteria, not blanket permission from a parts manufacturer.
Before choosing to replace one strut or both, ask:
- What evidence supports keeping the opposite strut?
- Can the replacement be matched to it?
- Do the vehicle’s service information and the replacement-part instructions support the proposed approach?
If those answers are uncertain, the case for retaining the companion is weaker.
When someone says “the manufacturer recommends it,” ask whether they mean the vehicle maker or the replacement-part maker, and which instruction applies to your repair. A general recommendation for paired replacement and a vehicle-specific installation procedure answer different questions. If the guidance appears to conflict, ask the shop to resolve that point before selecting a single replacement. Do not treat a general discussion of exceptions as approval for your particular vehicle.
Bring any previous suspension repair records to the inspection. Ask the technician to identify what was installed and whether the records agree with the parts now on the car. If the history is unknown, ask how that uncertainty affects the recommendation. A single replacement deserves an explanation of why the retained side remains suitable.
What needs to match besides physical fit?
BILSTEIN explains that replacement selection depends on the vehicle specification because dampers, springs, and bearings work together. Its product guidance also distinguishes original-equipment replacement tuning from other tuning. A part fitting the mounting points does not settle compatibility. BILSTEIN’s technical guidance covers these distinctions.
The repair recommendation should identify the correct application and suspension specification, including electronic compatibility where applicable. If a complete assembly changes the spring as well, ask how it matches the opposite side. I-CAR also identifies aged, worn, or unmatchable springs as reasons to consider paired spring replacement.
Ask the shop to describe what “matched” means for the proposed repair. Does the estimate specify a replacement intended to work with the retained unit? Is the recommendation based on the identified suspension equipment? If the proposed part differs from what is already installed, ask for the reason and how the shop has established compatibility. This is especially useful when comparing estimates that use different parts.
Also clarify whether the estimate covers the strut itself or an assembly that includes additional components. Ask which existing components would be retained and which would be replaced. That gives you a more useful comparison than simply counting the number of struts on each estimate.
What should the inspection establish?
Compare both sides for leakage, damage, ride control, and tire wear. Inspect mounts, bearings, and boots before deciding which parts need replacement. KYB notes that clunking can come from mounting problems; uneven tire wear can also involve pressure or alignment. Those findings should guide which parts are replaced. KYB’s inspection guidance supports that approach.
Abbott’s Auto Care lists suspension inspections and strut replacement among its services. Ask the shop for a current quote based on the inspection findings. If tire wear prompted the inspection, its guide to understanding uneven tire wear provides related context.
Ask for the inspection findings in plain language: what failed, what remains serviceable, and what is still uncertain? If the recommendation includes additional parts, ask which finding supports each item. The answer should connect the work to the condition of your vehicle.
It is also reasonable to ask what finding would change the recommendation from one strut to a pair. That question helps clarify whether the decision rests on the companion’s wear, a parts-matching problem, or the applicable instructions. You should be able to understand the reason before approving the repair.
Does alignment belong in the strut replacement plan?
Usually, yes. Monroe recommends alignment after strut replacement because wheel angles can change. It also recognizes exceptions where the design leaves those angles unaffected or provides no alignment adjustment. Follow the applicable vehicle procedure rather than assuming every installation is identical. Monroe’s alignment guidance explains those exceptions.
Abbott’s also offers wheel alignment. The repair plan should state whether alignment measurement and adjustment are included and explain any exception. Replacing one strut does not, by itself, establish that alignment can be skipped. When reviewing the estimate, ask how the shop will determine whether the finished alignment meets the vehicle’s specifications. If alignment is excluded, ask for the vehicle-specific reason.
