A complete strut assembly kit includes the strut itself, the spring, the mount, and the bearing — everything bolted together as one unit ready to install

When your car's suspension needs work, you have two ways to replace a strut: buy the parts separately and assemble them yourself, or buy them pre-assembled in a kit. A complete strut assembly comes with the shock absorber (the strut), the coil spring wrapped around it, the upper strut mount, and the bearing plate all attached. You unbolt the old assembly, bolt in the new one, and you're done. A piecemeal approach means buying a strut, a spring, a mount, and a bearing separately, then having a shop press the spring onto the strut — which requires a spring compressor tool most home mechanics don't own.

The kit route costs more upfront but saves you labor time and the cost of having someone press and assemble the parts. It also means fewer connection points that could loosen later. If you're doing the work yourself or taking it to a shop, understanding what's in the kit and why it matters helps you make the right choice for your car and your budget.

Key Takeaways

  • A complete strut assembly includes the shock, spring, mount, and bearing all pre-assembled, so installation is faster than buying parts separately.
  • Kits typically cost 30 to 50 percent more than a strut alone, but you avoid paying a shop to press the spring onto the strut.
  • Most kits are vehicle-specific, so you need your car's year, make, model, and whether it's the front or rear strut before ordering.
  • Installation requires removing the old assembly and bolting in the new one, a job that usually takes one to two hours per side at a shop.

What parts come in the kit

The strut itself is the shock absorber — a tube filled with pressurized gas and oil that dampens the up-and-down motion of your suspension. It's the main component doing the work. Wrapped around the strut is the coil spring, which supports the weight of your car and compresses when you hit a bump. The spring is held in place by the upper strut mount, a rubber-and-metal assembly that sits at the top of the strut and connects to your car's frame. Below that is the bearing plate, a flat piece that lets your wheel turn smoothly when you steer.

In a kit, all four parts arrive already assembled and torqued to the correct tightness. You don't have to compress the spring, thread it onto the strut, or position the mount — it's done. Some kits also include a new dust boot (a rubber cover that keeps dirt out of the strut) and new bump stops (rubber bumpers that cushion the suspension at full compression). Check the product description to see what's included with the specific kit you're looking at.

Kit cost versus buying parts separately

A complete strut assembly kit for a common sedan typically costs $150 to $400 per strut, depending on the brand and whether it's an OEM (original equipment manufacturer) part or an aftermarket one. A strut alone costs $80 to $200, a spring $40 to $100, a mount $30 to $80, and a bearing $15 to $40. So parts alone run $165 to $420 — roughly the same as a kit. The difference is labor: a shop charges $100 to $200 per strut to press the spring onto the strut and assemble the mount and bearing. For two struts (front or rear), that's $200 to $400 in assembly labor you avoid by buying a kit.

If you're doing the work yourself, the math changes. You'd need to rent or buy a spring compressor ($30 to $80 to rent, $150 to $400 to buy), and you need the right tools to remove and install the strut safely. Many home mechanics find the kit route simpler because it eliminates the spring compressor step entirely. If you're having a shop do the work, ask them whether they charge less to install a kit than to assemble parts — some do, some don't.

How to identify the right kit for your car

Strut kits are vehicle-specific. You need your car's year, make, model, and engine size to order the right one. You also need to know whether you're replacing the front strut or the rear strut — they are different and not interchangeable. Some cars have struts only in the front and coil springs in the rear; others have struts front and rear. Check your owner's manual or search your vehicle's year and make online to confirm which end needs a strut.

Once you have that information, search for the kit by vehicle. Most retailers (RockAuto, Amazon, AutoZone, Advance Auto Parts, and local shops) let you enter your vehicle details and filter by front or rear. Read the product description to confirm it lists your exact year and model — sometimes a kit fits multiple years, but not always. If you're unsure, call a local shop or the retailer's customer service line with your vehicle information and ask them to confirm the part number before you order.

OEM kits versus aftermarket kits

OEM kits are made by your car's manufacturer (Toyota, Honda, Ford, and so on) and meet the exact specifications your car was built with. They typically cost more — $250 to $500 per strut — but they last longer and handle the way the car was designed to handle. Aftermarket kits are made by independent companies like KYB, Bilstein, Monroe, and Strut-Mate. They cost less — $100 to $300 per strut — and work well for everyday driving, though some are softer or firmer than the original depending on the brand.

For most drivers, an aftermarket kit from a known brand is a good middle ground: it costs less than OEM, lasts several years, and handles predictably. If you want the car to feel exactly as it did when new, or if you drive a luxury or performance car where suspension tuning matters, OEM is worth the extra cost. If you're on a tight budget and just need the car to stop bouncing, a budget aftermarket kit works fine.

Installation: what to expect at a shop

Installing a complete strut assembly takes one to two hours per strut at a shop, depending on how corroded the old bolts are and whether the car needs an alignment afterward. The mechanic removes the wheel, unbolts the old strut from the frame and the steering knuckle (the part that holds the wheel), and slides in the new assembly. They torque the bolts to the manufacturer's specification and reinstall the wheel. If you're replacing both front struts, the job takes two to four hours total.

After installation, your car should have an alignment check, especially if you replaced the front struts. Misalignment causes uneven tire wear and pulls the steering to one side. An alignment costs $75 to $200 and takes 30 to 60 minutes. Some shops include it in the strut installation price; others charge separately. Ask before you approve the work. If you're doing the installation yourself, you'll need a jack, jack stands, a socket set, and a torque wrench. If you've never done suspension work, this is a good time to watch a video for your specific car model or ask a knowledgeable friend to walk you through it.

Signs your struts need replacement

Your struts wear out gradually, so you might not notice until the problem is obvious. Common signs include a bouncy or floating feeling when you drive, especially after bumps; nose-diving when you brake hard; leaning to one side when you turn; or a clunking sound from the front or rear suspension. Worn struts also make your car's headlights bounce at night, which is unsafe. If your tires are wearing unevenly or cupping (dipping in a wavy pattern), worn struts are often the cause.

Struts typically last 50,000 to 100,000 miles, though this varies by driving conditions and the quality of the strut. If you drive on rough roads, tow a trailer, or live where roads are salted in winter, they wear faster. If you're not sure whether yours need replacement, a mechanic can inspect them for leaks, damage, or excessive play — usually a free or low-cost check. Replacing them before they fail keeps your car safe and prevents damage to other suspension parts.

Frequently Asked Questions

Can I replace just one strut, or do I have to replace both?

You can replace one, but mechanics usually recommend replacing both on the same axle (both fronts or both rears) at the same time. If one is worn, the other is likely close behind, and mismatched struts can cause handling problems and uneven tire wear. The extra cost of one more strut is usually worth the balanced suspension.

Do I need an alignment after installing new struts?

An alignment check is recommended after front strut replacement because the suspension geometry changes slightly during installation. Rear struts don't always require an alignment, but ask your mechanic. An alignment ensures your tires wear evenly and your steering doesn't pull to one side.

What's the difference between a strut and a shock absorber?

A shock absorber is a single component that dampens suspension movement. A strut is a complete assembly that includes the shock, the spring, and the mount all in one unit. Struts are common in front suspensions; shocks are more common in rear suspensions or in older vehicles.

How long does a complete strut assembly last?

Most kits last 50,000 to 100,000 miles before they start to wear out. Premium or OEM kits may last longer. Driving on rough roads, towing, or frequent hard braking shortens the lifespan. Regular inspection helps you catch wear early.

Can I install a strut kit myself if I've never done suspension work?

It's possible but requires the right tools (jack, jack stands, torque wrench, socket set) and mechanical confidence. If you're unsure, have a shop do it. A mistake can affect your car's handling and safety. Many shops charge $100 to $200 per strut for labor, which is reasonable for the informed and liability.