You usually need an alignment after replacing struts, but not always
Whether you need a wheel alignment after replacing struts depends on what caused the strut to fail and how much the suspension geometry shifted during removal. If a strut failed because of age or internal wear, the suspension angles were probably already drifting, and alignment is worth doing. If you hit a pothole hard enough to damage the strut but the rest of the suspension stayed intact, you might not need it. The safest approach: have the shop measure your alignment angles before and after the replacement. If they've moved more than the manufacturer's tolerance, alignment is necessary. If they're still within spec, you can skip it.
The reason alignment matters is that struts are part of the suspension geometry that holds your wheels at specific angles to the road. When you remove a strut, you're breaking that geometry apart. Even if you reinstall everything correctly, small shifts happen. Worn suspension bushings, bent control arms from the same impact that broke the strut, or straightforward the way the suspension settles under its own weight can push the angles out of spec. Wheels that aren't aligned will pull to one side, wear unevenly, and reduce fuel economy.
Key Takeaways
- Strut replacement can shift wheel alignment angles because the suspension geometry is disturbed during the work, even if everything is reinstalled correctly.
- The best way to know if you need alignment is to have the shop measure angles before and after the replacement and compare them to the manufacturer's spec.
- If the angles are still within tolerance after the replacement, you do not need alignment; if they've drifted outside tolerance, you do.
- Worn suspension bushings or bent control arms from the same impact that damaged the strut may require alignment even if the strut replacement itself was straightforward.
What happens to alignment when you replace a strut
A strut is a structural part of the suspension that holds the wheel at a specific angle to the road. That angle is called camber — the tilt of the wheel inward or outward when viewed from the front. The strut also influences caster (the forward or backward tilt of the steering axis) and toe (whether the wheels point straight ahead or inward or outward). When you remove the strut, you're unloading all three of these angles at once.
During removal, the suspension hangs freely. When you bolt the new strut in place, the suspension settles back down under the weight of the vehicle. If the new strut is the same length and condition as the old one, and if nothing else in the suspension has changed, the angles should return to where they were. But that's a lot of "ifs." Suspension bushings wear over time and become softer, allowing more movement. The control arm itself might have been bent slightly by the same impact that broke the strut. The new strut might be a different brand or have slightly different internals that change how the suspension loads. Any of these can push the angles outside the manufacturer's tolerance.
When alignment is necessary after strut replacement
Alignment is necessary if the wheels have drifted outside the manufacturer's specification for camber, caster, or toe. You'll notice this as a pull to one side when you drive, uneven tire wear (one edge of the tire wearing faster than the other), or a steering wheel that's off-center when driving straight. These signs mean the angles have shifted enough to matter.
Alignment is most likely to be necessary if the strut failed because of age or wear rather than a sudden impact. An old strut that's been leaking fluid for months has already allowed the suspension to settle into a worn position. When you replace it with a new, stiffer strut, the suspension geometry changes. The new strut is firmer, so it holds the wheel at a different angle than the worn one did. Alignment brings the angles back to spec for the new strut.
Alignment is also necessary if the impact that damaged the strut also bent the control arm, tie rod, or other suspension components. If you replace only the strut and leave a bent control arm in place, the angles will be wrong no matter how good the new strut is. A thorough inspection during strut replacement should catch this, but it's worth asking the shop whether they found any other damage.
When you might not need alignment after strut replacement
If the strut failed from a sudden impact — a pothole, a curb strike, or a collision — but the control arms and other suspension parts are straight and undamaged, alignment may not be necessary. The suspension geometry was probably fine before the impact. The impact broke the strut but didn't bend anything else. A new strut of the same type and length will restore the geometry to what it was before the impact.
In this scenario, the shop should still measure the angles after the replacement to confirm they're within spec. But if they are, you can drive without alignment. Many shops will do this measurement for free or for a small fee, and it takes 15 to 20 minutes. It's worth the time to know for certain.
How to know whether your specific vehicle needs alignment
The only reliable way to know is to have the angles measured. A wheel alignment machine measures camber, caster, and toe on all four wheels and compares them to the manufacturer's specification for your vehicle. The spec varies by make, model, and year — a 2015 Honda Civic has different specs than a 2020 Civic. The machine prints a report showing which angles are in spec and which are out.
Ask the shop to measure the alignment before the strut replacement and again after. If the angles are the same and within spec, you don't need alignment. If they've moved but are still within spec, you don't need alignment. If they've moved outside spec, you do. This takes two alignment checks instead of one, which costs more upfront, but it gives you a clear answer and protects you from paying for alignment you don't need.
If the shop won't measure before and after, ask them to measure after the replacement and compare to the spec sheet. If the angles are within spec, you're done. If they're out, alignment is necessary. Most shops will include this post-replacement check as part of the job, especially if you ask before they start.
What to do if alignment is out of spec
If the angles are outside the manufacturer's tolerance, the shop should perform a four-wheel alignment. This involves adjusting the suspension components — usually the tie rods for toe, and sometimes the control arm position for camber — until all angles are within spec. The cost varies by shop and region, but typically ranges from $100 to $200 for a four-wheel alignment.
Some shops bundle alignment into the strut replacement cost if they discover it's necessary during the job. Others charge separately. Ask upfront what the shop's policy is. If they find that alignment is needed after the replacement is done, you should be able to see the before-and-after measurements to understand why.
After alignment, the steering wheel should be centered, the vehicle should track straight without pulling, and tire wear should be even. If any of these problems persist, the alignment may not have been done correctly, or there may be another suspension problem that wasn't caught. Ask the shop to recheck the alignment or to inspect for other damage.
Frequently Asked Questions
Will my car pull to one side if alignment is off after strut replacement?
Yes, if the toe or camber angles are significantly out of spec, the vehicle will pull to one side when you drive straight. The pull is usually toward the side with more negative camber. You might also notice the steering wheel is off-center or that you have to hold the wheel at an angle to drive straight.
Can I drive on the highway right after strut replacement if I haven't had alignment done?
If the alignment angles are still within spec, yes — the strut replacement alone doesn't make the vehicle unsafe to drive. But if the angles have drifted outside spec, highway driving will make the problem worse because the tires will heat up and wear faster. It's better to have the angles checked before driving long distances.
Does alignment cost extra if I get it done at the same time as strut replacement?
Usually not — most shops charge the same alignment fee whether you do it when ready after strut replacement or weeks later. Some shops include a post-replacement alignment check in the strut job cost. Ask before the work starts what's included and what costs extra.
What if only one strut is replaced — do I still need alignment?
Yes, for the same reason as replacing both struts. Even a single strut replacement disturbs the suspension geometry on that side of the vehicle. The angles should be measured after the replacement to confirm they're within spec.
Can worn suspension bushings cause alignment problems after strut replacement?
Yes. Bushings are rubber components that allow suspension parts to move slightly. When they wear, they become softer and allow more movement than they should. If the bushings were already worn before the strut replacement, the new strut may settle into a different position than the old one, pushing the angles out of spec. The shop should inspect the bushings during the strut job and flag any that are worn.