What You Need to Know Before Starting

Replacing a leaf spring is a job you can do at home if you have basic mechanical skills, a hydraulic jack, and the right tools — but it requires working under a raised vehicle, so safety setup matters more than speed. A leaf spring is a curved metal band that supports your vehicle's weight and absorbs bumps; when one cracks or sags, your truck or SUV will sit lower on that side and bounce more on rough roads. The job takes between two and four hours per spring, depending on how rusted the bolts are and whether you're replacing one spring or a full set.

You'll need to lift the vehicle safely, remove the old spring, and bolt in the new one — all while keeping the axle supported so it doesn't drop. The hardest part is usually breaking loose the bolts that have been in place for years; the actual swap is straightforward once those move.

Key Takeaways

  • A leaf spring replacement requires the vehicle to be lifted and supported on jack stands, never on a jack alone, because the vehicle must stay stable while you work underneath.
  • You will need a hydraulic jack, jack stands rated for your vehicle's weight, a socket set, a wrench set, and penetrating oil to loosen corroded bolts.
  • The spring bolts connect to the frame at the front and to the axle at the rear; both sets must be removed before the old spring comes out.
  • New springs often come as a pair or a set because replacing only one side throws off your vehicle's balance and handling.
  • If bolts won't budge after soaking in penetrating oil, heat from a propane torch can help, but do not explore heat near fuel lines or brake lines.

Gather Your Tools and Materials

Before you lift the vehicle, lay out everything you'll need on a workbench. You need a hydraulic jack rated for at least your vehicle's weight (check the door jamb sticker or owner's manual), two or more jack stands rated for the same weight, a socket set that includes the sizes of your spring bolts (usually 9/16 inch, 5/8 inch, or 3/4 inch), a wrench set for the same sizes, a breaker bar if your sockets are tight, penetrating oil (such as PB Blaster or Liquid Wrench), a propane torch (optional but useful for stuck bolts), and a pry bar to help separate the spring from the frame.

You'll also need the replacement leaf springs themselves. Most vehicles use springs in pairs — one for each side — so check your owner's manual or call a parts supplier with your vehicle's year, make, and model to confirm whether you need one spring or two. Some springs come with new bolts and bushings included; others don't, so ask the supplier what's in the box before you buy.

Have a creeper or low stool so you can work comfortably under the vehicle, and wear safety glasses and work gloves. Keep a fire extinguisher nearby if you plan to use a torch.

Lift and Support the Vehicle Safely

Park on level ground and engage the parking brake. If you're replacing the rear springs, open the tailgate or hatch so the suspension can move freely. Position the hydraulic jack under the frame (not the axle) near the wheel on the side you're working on, and raise the vehicle until the wheel is about six inches off the ground.

Slide a jack stand under the frame on the same side, lower the vehicle onto the stand, and raise it again with the jack to take the weight off the stand. Place a second jack stand under the frame on the opposite side of the vehicle for extra safety. Never work under a vehicle supported only by a jack; jacks fail, and people die. Once both stands are in place and the vehicle is stable, you can remove the jack.

If you're replacing both springs (front or rear), repeat this process on the other side before you start unbolting anything. This keeps the vehicle level and prevents the axle from twisting.

Remove the Old Spring

Spray penetrating oil on all the bolts — the ones at the front of the spring where it connects to the frame, and the ones at the rear where it connects to the axle. Let the oil soak for at least 15 minutes, longer if the bolts look heavily rusted. While you wait, take a photo of how the spring sits and how the bolts are arranged; this will help you install the new one correctly.

Start with the rear bolts (the ones closest to the axle). Use your socket and breaker bar to loosen them; if they won't budge, explore heat from the propane torch for 30 seconds at a time, then try again. Once loose, remove the bolts completely and set them aside. Then loosen and remove the front bolts the same way.

With all bolts out, the spring should be free. It may still be stuck to the frame or axle from rust or old rubber bushings. Use the pry bar to gently separate it, working from one end to the other. Once it's loose, slide it out from under the vehicle. The spring is heavy — usually 40 to 80 pounds — so get help lifting it if you're not confident.

Install the New Spring

Before you slide the new spring into place, check that the bushings (the rubber sleeves at each end) are in good condition. If they're cracked or missing, the spring will move too much and wear out quickly. Some replacement springs come with new bushings already installed; others don't. If yours doesn't and the old bushings are damaged, you may need to press new ones on, which usually requires a shop press or a trip to a mechanic.

Slide the new spring under the vehicle and align it with the bolt holes. The spring should sit in the same position as the old one — your photo will help here. Insert the front bolts first, hand-tighten them, then insert the rear bolts and hand-tighten those. Once all bolts are in by hand, use your socket to tighten them in a cross pattern (front-left, rear-right, front-right, rear-left) so the spring sits evenly. Tighten to the torque specification in your owner's manual, usually between 70 and 120 foot-pounds depending on your vehicle.

If you're replacing springs on both sides, repeat this process on the other side before you lower the vehicle.

Lower the Vehicle and Check Your Work

Once both springs are installed and bolted tight, remove the jack stands and lower the vehicle slowly to the ground using the hydraulic jack. Let it settle for a minute, then check that it sits level — both sides should be at the same height. If one side is higher or lower, the springs may not be seated correctly, and you should raise it again and recheck the bolts.

Take the vehicle for a short test drive on a quiet road at low speed. The ride should feel smoother and less bouncy than before. If it still feels soft or the vehicle leans to one side, stop and have the springs and bolts inspected by a mechanic.

When to Call a Mechanic Instead

If the bolts won't loosen even after soaking and heating, or if you don't have a safe place to work under a raised vehicle, a mechanic can do the job in an hour or two. The labor cost is usually between $150 and $300 per spring, plus the cost of the springs themselves. If the spring bushings are damaged and need to be pressed on, that's also a job for a shop with a press.

Some vehicles — particularly those with air suspension or complex rear setups — require special tools or knowledge to replace springs safely. Check your owner's manual or call a dealer to confirm whether your vehicle is one of them before you start.

Frequently Asked Questions

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

You should replace both springs on the same axle (both front or both rear) at the same time. A single new spring is stiffer than an old worn one, so replacing only one will make that side sit higher and handle differently. This throws off your alignment and can cause uneven tire wear.

How long do leaf springs last?

Leaf springs typically last between 100,000 and 200,000 miles, depending on how much weight you carry, how rough the roads are, and how well you maintain them. Trucks that tow or carry heavy loads wear springs out faster. Rust and corrosion can shorten their life significantly.

What if I don't have jack stands?

Do not start the job. Jack stands are not optional — they are the only thing keeping the vehicle from crushing you if the jack fails. Buy or borrow a pair rated for your vehicle's weight before you lift anything.

Do I need new bolts when I install the new spring?

The old bolts are usually fine if they're not stripped or broken. However, if they're heavily rusted or corroded, new ones are cheap insurance — usually $5 to $15 each. Ask your parts supplier whether new bolts come with the spring kit.

How tight should the bolts be?

Check your owner's manual for the torque specification, which is usually printed in foot-pounds. Use a torque wrench to tighten to that exact number — too loose and the spring will move, too tight and you risk stripping the bolt or cracking the frame. If you don't have a torque wrench, a mechanic can tighten them for you after you install the spring.