Trailer equalizers are a key part of the suspension system on tandem and triple axle trailers. When they wear out, crack, or develop excessive play, they can cause uneven tire wear, rough towing, poor load distribution, and suspension damage. Replacing bad equalizers can help restore ride quality and improve tire life.
Here’s a step-by-step guide to replacing worn trailer equalizers.
Signs Your Equalizers Need Replacing
Before starting, look for these common warning signs:
- Uneven or odd tire wear
- Clunking suspension noises
- Cracked or bent equalizer
- Worn bushings
- Elongated bolt holes
- Excessive suspension movement
- Trailer sitting unevenly
If the equalizer shows visible wear or looseness, replacement is usually recommended.
Tools & Supplies Needed
Before beginning, gather:
- Floor jack (rated for trailer weight)
- Heavy-duty jack stands
- Wheel chocks
- Socket and wrench set
- Breaker bar or impact wrench
- Hammer or rubber mallet
- Pry bar
- Replacement equalizer
- New bolts, shackles, and bushings (recommended)
- Torque wrench
- Grease (for wet bolt systems)
Step 1: Park on Level Ground & Secure the Trailer
Park the trailer on a flat, solid surface.
Before lifting:
- Chock the wheels securely
- Disconnect tow vehicle if needed
- Make sure the trailer cannot roll
Safety matters when working on suspension components under load.
Step 2: Lift & Support the Trailer
Jack up the trailer frame—not the axle.
Raise the trailer high enough to remove pressure from the suspension system.
Place jack stands under the frame securely.
Allow the axles to hang slightly so the equalizer and shackles can move freely.
Step 3: Remove the Wheels (Optional but Recommended)
Removing the wheels gives easier access to suspension components.
This can make removing bolts and inspecting wear much easier.
Step 4: Inspect the Suspension System
Before removing anything, inspect:
- Leaf springs
- Shackles
- Bushings
- Wet bolts
- Hangers
If parts are worn, now is the best time to replace them.
Many suspension problems happen together, and installing a new equalizer with worn shackles often leads to continued issues.
Step 5: Remove the Old Equalizer
Support the axle slightly with a jack if needed to relieve tension.
Remove:
- Shackle bolts connecting leaf springs
- Center equalizer bolt
You may need a hammer or pry bar if bolts are seized.
Once removed, pull the old equalizer out.
Look for signs of failure such as:
- Cracks
- Ovalized bolt holes
- Broken bushings
- Excessive wear
Step 6: Install New Bushings (If Needed)
Many replacement equalizers require bushings.
Install:
- Nylon bushings
- Bronze bushings
- Wet bolt compatible bushings
depending on your suspension setup.
Proper bushing fitment is important for long-term performance.
Step 7: Install the New Equalizer
Position the new equalizer in place.
Install the center bolt first, followed by the shackle bolts.
Do not fully tighten everything immediately.
Allow the suspension to settle naturally first.
Step 8: Tighten Hardware Properly
Once installed:
- Lower the trailer enough to place weight on suspension
- Torque bolts to manufacturer specifications
Do not overtighten suspension bolts.
Shackle links must move properly during suspension travel.
If using wet bolts, grease all fittings after installation.
Step 9: Reinstall Wheels & Test
Reinstall wheels and torque lug nuts properly.
Take the trailer for a short test drive and inspect:
✔ Suspension movement
✔ Tire alignment appearance
✔ No unusual noises
✔ Proper ride height
Recheck bolt tightness after several miles of towing.
Replace More Than Just the Equalizer?
In many cases, replacing:
- Shackles
- Wet bolts
- Bushings
- Suspension hardware
at the same time is worth considering.
A worn suspension system can quickly wear out new parts if old components remain loose.
Keep Your Trailer Suspension Working Properly
Replacing worn equalizers can improve ride quality, reduce tire wear, and help keep your trailer towing safely. If you need help finding the right equalizer kit, suspension hardware, or replacement parts, Highway Trailer Company can help match the right setup for your trailer.