What is a strut mount? Replacement Cost, and More
You hear a loud bang every time you hit a pothole. Your steering feels loose, and the ride is rough. You worry your suspension is falling apart.
A strut mount is a suspension component that attaches the top of the suspension strut to the vehicle’s chassis. It usually consists of a rubber insulator bonded to a metal plate, designed to absorb road vibrations and noise while supporting the vehicle’s weight.
Replacing this part restores the comfort and silence of your ride. I will explain exactly what this part does, how much it costs to fix, and how to spot a failure before it causes more damage.
What is strut mount?
Most drivers confuse the strut mount with the shock absorber itself. If you order the wrong part, you will be stuck with a dismantled car and no way to finish the repair.
A strut mount is the bridge between your suspension and your car’s body. It acts as a cushion, insulating the cabin from the metal-on-metal impact of the suspension moving up and down.
I work closely with the production team at GSW Autoparts, and I see how these mounts are engineered. A strut mount is deceptive. It looks like a simple chunk of rubber glued to a metal plate, but the chemistry is complex. The rubber must be dense enough to hold up 1,000 pounds of car corner weight, but soft enough to absorb the buzz from the asphalt.
Think of the strut mount like the sole of a running shoe. Your foot is the car body. The ground is the tire. The strut mount is the gel cushion in the heel. Without it, every step would send a shockwave right up your spine.
On the front of the car, the mount usually includes a bearing (or sits on top of one). This is because the front wheels have to steer. The bearing allows the strut to spin. The rear mounts usually do not have bearings because the rear wheels do not steer.
We test our rubber formulas to resist heat and oil. If the rubber is cheap, engine heat will cook it, and it will crack within a year. That is why the quality of the rubber bonding is the most critical part of this component.
Component Breakdown:
| Part | Function | Material |
|---|---|---|
| Mounting Plate | Bolts to the vehicle tower. | Steel or Aluminum |
| Insulator | Absorbs vibration and noise. | Vulcanized Rubber |
| Bearing (Front only) | Allows steering rotation. | Steel/Plastic & Grease |
| Sleeve | Center guide for the strut shaft. | Hardened Steel |
How to install strut mounts?
This is not a simple oil change. You are dealing with high-tension springs that can cause serious injury if handled incorrectly. You need to know the risks.
To install a strut mount, you must remove the strut assembly from the vehicle, compress the coil spring with a specialized tool to release tension, remove the top nut, swap the mount, and re-torque everything to spec.
I have seen the aftermath of DIY repairs gone wrong. A coil spring under tension holds enough energy to punch a hole through a concrete wall. Never remove the center nut on top of the strut while the strut is still in the car or uncompressed.
Step-by-Step Installation Overview:
- Prep: Jack up the car and place it on stands. Remove the wheel.
- Disconnect: Unbolt the sway bar link, brake line brackets, and the lower knuckle bolts.
- Drop: Remove the top mounting bolts (under the hood) and pull the strut assembly out.
- Compress: Use a heavy-duty spring compressor. Tighten it until the spring is loose between the plates.
- Swap: Remove the center shaft nut. Take off the old mount. Inspect the bearing. If you are changing the mount, change the bearing too. Put the new GSW Autoparts mount on.
- Tighten: Torque the top nut. Release the spring slowly.
- Align: Reinstall the strut and get a wheel alignment.
I always recommend checking the condition of the dust boot and the bump stop (the foam piece) while you have the strut apart. It costs almost nothing to replace them now, but it costs hours of labor to do it later.
Tool Checklist:
- Jack and Jack Stands
- Socket Set and Breaker Bar
- Coil Spring Compressor (Mandatory)
- Torque Wrench
- Pass-through Ratchet (Helpful for the top nut)
Symptoms Of A Bad Strut Mount
You hear noises, but you do not know if it is a ball joint, a bushing, or the mount. Diagnosing it correctly saves you from buying parts you do not need.
Common symptoms include clunking or rattling noises when going over bumps, vibration in the steering wheel, loose handling, and visible cracks or separation in the rubber when looking under the hood.
I diagnose these issues often. The most obvious sign is the "Clunk Test." Drive over a speed bump slowly. If you hear a hollow clunk coming from the dashboard area or the top of the fender, it is likely the mount. The rubber has collapsed, and metal is hitting metal.
Another sign is visual. Open the hood. Look at the strut towers1. If the rubber looks like dried mud2—cracked, tearing, or crumbling—it is dead. Sometimes, the center metal sleeve will tear completely free from the rubber. When this happens, the strut shaft can actually push up and dent your hood.
Vibration is a more subtle sign. The mount’s job is insulation. If the rubber hardens with age, it stops absorbing road buzz. You will feel a fine vibration in the steering wheel and the floor pedals that matches the texture of the road.
Symptom Cheat Sheet:
- The Sound: Clunking, banging, or rattling on rough roads.
- The Feel: Excessive vibration in the cabin.
- The Look: Cracks in the rubber, or the center pin sits off-center.
- The Steering: If the bearing in the mount is seized, the steering will be stiff or make a "creaking door" sound.
How Much Does It Cost to Replace a Strut Mount?
You want to fix the ride, but you are worried about the bill. Understanding the breakdown of parts versus labor helps you negotiate with your mechanic.
Replacing a strut mount typically costs between $200 and $450 per side. The part itself is inexpensive ($30-$80), but the labor is significant because the mechanic must disassemble the suspension.
In my experience supplying workshops, labor makes up about 70% of this bill. To change a $40 mount, the mechanic has to do the exact same amount of work as changing the entire strut.
This brings me to my most important piece of advice: Do not just replace the mount.
If your car has over 50,000 miles, the shock absorber is likely worn too. Since you have to pay the labor to take the strut out and take it apart anyway, put a new shock and a new spring in there.
Many companies, including GSW Autoparts, offer "Loaded Struts" or "Quick Struts." This is a pre-assembled unit: New Mount + New Spring + New Shock + New Bearing. You buy the whole thing. The mechanic just swaps it in. It saves an hour of labor per side because they do not have to use the spring compressor. The part costs more, but the total bill is often similar, and you get a brand new front end.
Estimated Cost Table (Per Side):
| Item | DIY Cost | Shop Cost |
|---|---|---|
| Strut Mount (Part) | $30 – $60 | $50 – $90 |
| Labor (Time) | $0 | $150 – $250 |
| Alignment | N/A | $80 – $120 |
| Total | $30 – $60 | $280 – $460 |
Note: Always replace mounts in pairs (left and right) to ensure the car sits level and handles predictably.
Conclusion
The accuracy of strut mount selection and routine maintenance directly affect vehicle ride comfort and suspension system lifespan.
When selecting a strut mount, priority should be given to matching the vehicle model, suspension type, and load parameters: for family commuter vehicles, vulcanized rubber strut mounts conforming to original equipment manufacturer (OEM) specifications can be used to balance shock absorption and fuel economy; for off-road, heavy-duty vehicles, or models frequently driven on bumpy roads, it is recommended to upgrade to strut mounts made of high-elasticity polyurethane material, which has superior tear resistance, high and low temperature resistance, and can withstand high-frequency impact loads.
A worn strut mount ruins your ride quality and damages other suspension parts. Listen for the clunking sounds and check for cracked rubber to catch the problem early.
GSW’s Strut Mounts are of excellent quality and offer top-notch service, making them an excellent partner.
About the Author
Root is a Content & Operations Specialist at GSWAUTOPARTS with 5 years of industry experience. Leveraging his close proximity to our manufacturing floor, Root specializes in documenting product details and production processes. He focuses on translating technical insights about rubber and chassis parts into clear, helpful information for our customers.
