Repair Snapshot
Use a mechanic if the coil spring must be compressed and you do not have a high-quality spring compressor or experience using one. A pro is also the better choice if the strut is heavily rusted, the shaft spins freely, or an alignment issue needs diagnosis.
This article is part of our Suspension and Steering Maintenance & Repair Guides.
Replacing strut mounts can restore quiet steering, reduce clunks over bumps, and fix looseness at the top of the suspension, but it is not a casual beginner job.
On many vehicles, the strut mount sits above the front strut assembly and cushions road shock while allowing the strut to rotate as you steer. When the rubber separates or the bearing wears out, you may hear popping, groaning, or knocking from the top of the suspension, especially while turning or driving over rough roads.
The biggest issue is safety: most strut mount replacements require compressing the coil spring. If you are not fully comfortable working with a loaded spring and following the factory torque procedure, have a professional handle the repair.
What a Strut Mount Does and When to Replace It
A strut mount attaches the top of the strut assembly to the vehicle body. It usually contains a rubber isolator to absorb noise and vibration, and on many front suspensions it also includes a bearing plate that lets the strut turn smoothly with the steering.
Replace the mount when the rubber is cracked or separated, the bearing binds or grinds, the top of the strut moves excessively, or you hear a repeated clunk from the upper suspension area. Uneven steering feel, memory steer, and popping when turning the wheel are also common signs.
- Clunking or knocking over bumps
- Groaning or popping while turning the steering wheel
- Visible separation or collapse of the upper mount rubber
- Steering that does not return to center smoothly
- Excessive play at the top of the strut assembly
Before You Start
Confirm Whether You Are Replacing Only the Mount or the Complete Strut Assembly
If your struts are old, leaking, or weak, replacing the complete loaded strut assembly is often the smarter move. A loaded assembly comes preassembled with the spring and mount already installed, which avoids the most dangerous part of this job. If the strut itself is still good and only the mount or bearing has failed, you may choose to replace just the upper mount.
Check Service Information First
Look up your exact year, make, model, and engine for torque specs and special notes. Some vehicles use camber-adjusting lower strut bolts, one-time-use hardware, or strut shaft designs that require a pass-through socket and hex key to remove the top nut.
Plan for an Alignment
Any time a strut assembly is removed, suspension geometry can shift. Even if you mark the bolt positions, you should expect to schedule a front-end alignment after the repair.
Safety Precautions
This job carries high risk because a compressed coil spring stores a huge amount of energy. Never loosen the center strut shaft nut until the spring is fully compressed and no longer pressing on the upper mount.
- Work on a flat surface and support the vehicle securely with jack stands.
- Wear eye protection and keep your body out of the spring’s path.
- Use a quality spring compressor in good condition and install it exactly as directed.
- Compress the spring evenly, alternating side to side to prevent slipping.
- If the compressor shifts, binds, or feels unstable, stop immediately.
If you have any doubts about spring compression, switch to a complete loaded strut assembly or let a shop perform the mount replacement.
How to Remove the Strut Assembly
Loosen the Wheel and Raise the Vehicle
Loosen the lug nuts slightly, raise the affected end of the vehicle, and support it on jack stands. Remove the wheel and place it aside.
Disconnect Anything Attached to the Strut Body
Most vehicles have a brake hose bracket, ABS wire clip, sway bar end link, or all three attached to the strut. Remove these carefully so the hoses and wiring are not stretched when the strut comes out. Penetrating oil helps on rusty fasteners.
Support the Steering Knuckle
Place a jack under the lower control arm or steering knuckle to support its weight. This helps prevent strain on the axle, brake hose, or ball joint when you remove the lower strut bolts.
Mark Bolt Positions if Applicable
If the lower strut-to-knuckle bolts have slotted holes or camber adjustment, mark their current positions with a paint marker before loosening them. This does not replace an alignment, but it can help get the vehicle closer for the drive to the alignment shop.
Remove the Lower Strut Fasteners
Remove the bolts or nuts connecting the strut to the steering knuckle. These fasteners are often very tight, so use a breaker bar as needed. If the bolts are seized, avoid hammering on threaded ends without protecting them with the nut first.
Remove the Upper Mount Nuts
Open the hood and locate the upper mount fasteners at the strut tower. Remove the outer mount nuts while supporting the strut from below. Do not remove the large center shaft nut yet. Once the upper mount nuts are off, lower the strut assembly out of the wheel well.
How to Disassemble the Strut Safely
Inspect and Index the Assembly
Before taking anything apart, note how the spring, upper mount, isolators, and bearing are oriented. Many mounts are directional, and the top plate may need to face a specific direction relative to the lower spring seat. Take photos and add alignment marks with a paint marker.
Compress the Spring Evenly
Install the spring compressor on opposite sides of the coil, making sure the hooks are fully seated and secure. Tighten each side gradually, alternating back and forth until the spring is compressed enough that the upper mount is no longer loaded. You should be able to see that the upper plate can move slightly without spring pressure.
Remove the Center Shaft Nut
Hold the strut shaft with the required hex or Torx bit while loosening the center nut with the correct pass-through or offset tool. Avoid gripping the polished shaft with locking pliers, since damage to the shaft can ruin the strut seal.
Lift Off the Upper Components
Remove the old strut mount, bearing, dust boot, bump stop, and upper isolator as needed. Keep the parts in order on a clean bench. Compare the old and new components carefully before reassembly.
How to Install the New Strut Mount
Inspect Related Parts While the Assembly Is Apart
This is the best time to inspect the strut cartridge for leaks, the spring for cracks, the dust boot for tears, and the bump stop for deterioration. If the bearing is separate from the mount, replace it now rather than reusing a questionable one.
Position the Spring Correctly
Set the lower end of the coil spring into the pocket of the lower spring seat exactly as it was before. If the spring tail is mispositioned, the vehicle may sit unevenly and the mount can bind or make noise.
Install the New Mount and Bearing in the Right Orientation
Place the new bearing, isolator, and mount on the strut in the same order and direction as the original parts. Some mounts have arrows, left/right markings, or notch references that must face inward, outward, or toward the engine bay. Follow the part instructions and vehicle service information.
Tighten the Center Shaft Nut to Spec
Install the center nut and tighten it to the factory specification while holding the shaft from spinning. Use thread locker only if specified by the manufacturer. Under-tightening can cause clunks; over-tightening can damage the mount or bearing.
Release the Spring Compressor Slowly
Double-check that the spring ends are seated properly and that the upper mount is clocked correctly. Then loosen the compressor evenly, alternating side to side until the spring fully seats against the upper and lower perches.
How to Reinstall the Strut Assembly
Set the Strut Into the Tower First
Guide the upper studs through the strut tower and start the top nuts by hand to hold the assembly in place. Do not fully tighten them yet unless your service procedure calls for it.
Reconnect the Knuckle and Lower Fasteners
Align the strut with the steering knuckle and install the lower bolts and nuts. If there were alignment marks, line them up as closely as possible. Torque the hardware to factory spec. Replace any torque-to-yield or one-time-use fasteners instead of reusing them.
Reconnect Brackets and Links
Reattach the sway bar end link, brake hose bracket, and ABS wire retainers. Make sure nothing is twisted, pinched, or rubbing the tire.
Torque the Upper Mount Nuts and Reinstall the Wheel
Tighten the upper mount nuts to specification. Reinstall the wheel, snug the lug nuts, lower the vehicle, and torque the lug nuts in the proper pattern.
Final Checks and Post-Repair Steps
Turn the steering wheel from lock to lock while the vehicle is stationary and listen for binding, popping, or spring noise. Then take a short, careful test drive over mild bumps and through a few low-speed turns.
After the test drive, recheck visible fasteners, make sure the brake hose and ABS wire routing are correct, and look for any signs that the spring has shifted in its seats. If the steering wheel is off-center, the car pulls, or tire wear was already present, get the alignment done immediately.
- No clunking from the strut tower area
- Smooth steering return without groaning or popping
- Brake hose and ABS wire secured to all brackets
- Vehicle ride height appears even side to side
- Alignment scheduled or completed
Common Mistakes to Avoid
- Removing the center shaft nut before the spring is safely compressed
- Reassembling the mount or bearing in the wrong order or orientation
- Failing to seat the spring tail in the spring perch
- Using an impact tool on the strut shaft when the manufacturer says not to
- Reusing one-time-use suspension hardware
- Skipping the alignment after strut removal
- Replacing only one side when both mounts are similarly worn
If one mount has failed due to age, the other side is often not far behind. Replacing strut mounts in pairs usually gives better ride quality and more even steering feel.
Torque and Adjustment Notes
Exact torque specifications vary widely by vehicle, so always use factory service information or a reliable repair manual. The most important fasteners are the center shaft nut, upper mount nuts, lower strut-to-knuckle bolts, sway bar link hardware, and wheel lug nuts.
If your vehicle uses camber bolts, eccentric washers, or slotted lower holes, the position of the strut affects alignment directly. Marking the old position may help, but it is only a temporary reference. Professional alignment equipment is the only way to set camber and toe accurately.
Key Takeaways
- Do not remove the center strut nut until the coil spring is fully and evenly compressed.
- Photograph and mark the spring, bearing, and mount orientation before disassembly to prevent reassembly errors.
- Torque all suspension fasteners to spec and replace one-time-use hardware when required.
- Plan on a wheel alignment after removing the strut assembly, even if you marked the bolt positions.
- If you are unsure about using a spring compressor, replace the complete loaded strut or hire a professional.
FAQ
Can I Replace Just the Strut Mount and Keep the Old Strut?
Yes, if the strut is still in good condition and the only failed part is the mount or bearing. But if the strut is leaking, bouncy, or high-mileage, replacing the complete strut assembly is usually the better long-term repair.
Do I Need an Alignment After Replacing Strut Mounts?
In most cases, yes. Removing the strut assembly can affect camber and toe, so a front-end alignment is recommended after reinstallation.
Should Strut Mounts Be Replaced in Pairs?
Yes, that is usually the best practice. If one side is worn out, the other side often has similar age and wear, and replacing both sides helps maintain balanced ride and steering feel.
What Happens if I Install the Strut Mount Backward?
The steering can bind, the spring may sit incorrectly, the vehicle may make new noises, and alignment can be affected. Always compare the new part to the old one and follow any directional markings.
Can I Use an Impact Gun on the Top Strut Nut?
Sometimes, but it depends on the vehicle and the manufacturer’s procedure. Many designs require holding the shaft with a hex or Torx bit while tightening or loosening the nut, and improper impact use can damage the shaft or mount.
Is a Loaded Strut Assembly Easier than Replacing Only the Mount?
Yes. A loaded assembly is much easier and safer for many DIYers because the spring comes precompressed and installed, eliminating the need to disassemble the old strut.
What Noises Do Bad Strut Mounts Make?
Common sounds include clunking over bumps, popping or groaning when turning, and sometimes a creaking noise from the top of the strut tower.
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