How to Replace Front and Rear Struts on a 2015 Subaru Legacy (Quick-Strut Guide)
Step-by-step instructions with tools, parts list, safety tips, and torque specs plus alignment checklist
How to Replace Front and Rear Struts on a 2015 Subaru Legacy (Quick-Strut Guide)
Step-by-step instructions with tools, parts list, safety tips, and torque specs plus alignment checklist


🔧 Legacy - Strut Replacement
Replacing the struts restores ride control, braking stability, and prevents uneven tire wear. On your Legacy, you’ll remove the strut assemblies (front and/or rear) and install new ones, then get an alignment.
Difficulty Level: Advanced | Estimated Time: 4-8 hours
Assumption: You’re replacing complete “quick-strut” assemblies (recommended).
⚠️ Safety & Precautions
- ⚠️ Never loosen the strut center nut unless the spring is safely compressed.
- ⚠️ Use jack stands; never rely on a floor jack alone.
- ⚠️ Support the steering knuckle so you don’t over-stretch the CV axle.
- ⚠️ Mark camber bolt positions before removal to keep alignment close.
- ⚠️ Keep hands clear of pinch points when separating the knuckle from the strut.
- Battery disconnect is not required for this job.
🔧 Required Tools
You'll need the following tools for this repair:
- Floor jack (rated 3-ton minimum)
- Jack stands (rated 3-ton minimum)
- Wheel chocks
- Safety glasses
- Mechanic gloves
- Breaker bar (1/2" drive)
- Torque wrench (1/2" drive, 30-200 ft-lbs range)
- Torque wrench (3/8" drive, 10-80 ft-lbs range)
- Ratchet (3/8" drive)
- Socket set 10mm-19mm (3/8" drive)
- Socket set 14mm-21mm (1/2" drive)
- Wrench set 12mm-19mm
- Pass-through strut nut socket set (specialty)
- Hex key set (metric)
- Pry bar (18")
- Needle-nose pliers
- Trim panel tool set
- Paint marker
- Penetrating oil
- Bungee cord
- Coil spring compressor (specialty)
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Front quick-strut assemblies - Replace in pairs - Qty: 2
- Rear quick-strut assemblies - Replace in pairs - Qty: 2
- Front strut-to-knuckle hardware - Qty: 1 kit
- Rear strut lower bolt/nut hardware - Qty: 1 kit
- Anti-seize compound - Qty: 1
📋 Before You Begin
- Park on level ground, turn the steering wheel straight, and set the parking brake.
- Chock the wheels that stay on the ground using wheel chocks.
- Crack the lug nuts loose with a 19mm socket and breaker bar before lifting.
- Spray visible strut bolts and sway bar end link nuts with penetrating oil and wait 5-10 minutes.
- If doing the rear, open the trunk and clear cargo so you can access the upper mounts.
🔨 Step-by-Step Instructions
Follow these steps in order:
Step 1: Lift and remove the wheel
- Lift the corner with a floor jack and place jack stands under safe lift points.
- Remove lug nuts using a 19mm socket, then remove the wheel.
Step 2: (Front) Disconnect brackets and the sway bar end link
- Remove the brake hose/ABS wire brackets from the strut using a 10mm socket or 12mm socket (varies by bracket).
- Remove the front sway bar end link nut at the strut using a 17mm wrench and hex key to hold the stud if it spins.
Step 3: (Front) Mark camber bolt position
- Use a paint marker to mark the relationship between the strut and steering knuckle at the upper strut-to-knuckle bolt.
- This helps keep alignment close enough to drive to the shop.
Step 4: (Front) Remove strut-to-knuckle bolts
- Support the steering knuckle with a bungee cord so it doesn’t drop and pull on the axle.
- Remove the two strut-to-knuckle bolts using a 19mm socket and breaker bar while holding the nut with a 19mm wrench.
- Tap bolts out gently if stuck.
Step 5: (Front) Remove upper strut mount nuts and remove strut
- Open the hood.
- Remove the upper strut mount nuts using a 12mm socket or 14mm socket (varies by mount).
- Hold the strut with one hand as you remove the last nut, then pull the strut assembly out.
Step 6: (Rear) Access rear upper strut mount nuts
- In the trunk, remove the trim panels near the strut towers using a trim panel tool set and needle-nose pliers.
- Locate the rear upper mount nuts.
Step 7: (Rear) Remove lower bolt, then upper nuts, then remove strut
- At the rear knuckle, remove the lower strut bolt/nut using a 17mm socket or 19mm socket and a matching wrench (varies by hardware).
- In the trunk, remove the upper mount nuts using a 12mm socket or 14mm socket (varies by mount).
- Pull the rear strut assembly out of the wheel well.
Step 8: If you are NOT using quick-struts (spring transfer)
- Install a coil spring compressor (specialty) on the spring. This tool clamps the spring so it can’t expand violently.
- Compress evenly, alternating sides with a ratchet until the spring is loose in the mount.
- Remove the center strut nut using a pass-through strut nut socket set (specialty) and hex key set (metric) to hold the shaft.
- Transfer mount/bearing/boot, then reassemble and slowly release the compressors.
Step 9: Install the new strut assembly (Front)
- Position the strut in the tower and hand-thread the upper mount nuts using a 12mm socket or 14mm socket.
- Slide the knuckle into place and install the two strut-to-knuckle bolts using a 19mm socket and 19mm wrench.
- Align your paint marks before final tightening.
- Torque upper mount nuts to 39 Nm (29 ft-lbs).
- Torque strut-to-knuckle bolts to 175 Nm (129 ft-lbs).
Step 10: Reattach end link and brackets (Front)
- Install the sway bar end link nut using a 17mm wrench and hex key as needed.
- Torque sway bar end link nut to 55 Nm (41 ft-lbs).
- Reinstall brake hose/ABS brackets using a 10mm socket or 12mm socket.
- Torque small bracket bolts to 18 Nm (13 ft-lbs).
Step 11: Install the new strut assembly (Rear)
- Position the rear strut and hand-thread the upper nuts using a 12mm socket or 14mm socket.
- Install the lower bolt/nut using a 17mm socket or 19mm socket and matching wrench.
- Torque rear upper mount nuts to 39 Nm (29 ft-lbs).
- Torque rear lower strut bolt to 140 Nm (103 ft-lbs).
- Reinstall trunk trim using a trim panel tool set.
Step 12: Reinstall wheels and lower the car
- Reinstall wheels and hand-thread lug nuts.
- Lower the car off the jack stands using the floor jack.
- Torque lug nuts to 120 Nm (89 ft-lbs) in a star pattern using a torque wrench.
✅ After Repair
- Start the car and turn the steering lock-to-lock slowly to confirm no rubbing or hose stretch.
- Road test at low speed first; listen for clunks over bumps.
- Get a 4-wheel alignment as soon as possible (same day is ideal).
- Recheck lug nut torque after 25-50 miles using a torque wrench.
💰 DIY vs Shop Cost
Shop Cost: $900-$1,800 (parts + labor)
DIY Cost: $300-$1,000 (parts only)
You Save: $600-$800 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-6 hours.
🎯 Ready to get started?
HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.

















