DIY Trailer Repair: How to Replace an Axle


Trailer axle replacement can seem like a daunting task, but it doesn’t have to be. If you’re a DIY enthusiast looking to tackle this repair to keep your trailer roadworthy and safe, this guide is for you. Whether you’re working with a full-size RV, a small utility trailer, or even a boat trailer, knowing the basics will save you time and money.

Quick Steps for Trailer Axle Replacement:
1. Jack up the trailer – Use a floor jack and secure it with jack stands.
2. Remove the wheels – Loosen and set aside the lug nuts and wheels.
3. Disconnect brakes (if needed) – Cut power and ground wires for electric brakes.
4. Remove shackles and hangers – Remove attaching bolts and supports.
5. Replace the old axle with a new one – Align the new axle properly and reattach bolts.

By following these steps, you can confidently replace your trailer axle without professional help. Ensuring your trailer is in top shape enhances safety and can prevent costly repairs down the line. Stay tuned as we delve deeper into each step!

Steps for Trailer Axle Replacement - trailer axle replacement infographic infographic-line-5-steps

Understanding Trailer Axles

When it comes to trailer axles, understanding the different types and their specific functions is essential for any DIY repair. Let’s break down the basics.

Types of Trailer Axles

There are two main types of trailer axles: spring axles and torsion axles.

Spring Axles

Spring axles are the most common type, especially for utility and cargo trailers. They use leaf springs to absorb shocks and bumps from the road.

  • Benefits:
  • Affordable
  • Easy to maintain and repair
  • Good for heavy loads

  • How They Work: Leaf springs are mounted to the axle and the trailer frame, allowing the axle to flex and absorb impact, which helps in distributing the load evenly.

Torsion Axles

Torsion axles are a bit more advanced. They use a system of rubber cords inside the axle housing to provide suspension.

  • Benefits:
  • Smoother ride
  • Less maintenance
  • Better handling for lighter loads

  • How They Work: Rubber cords inside the axle twist under load, providing suspension without the need for additional springs. This results in a smoother and quieter ride.

Comparing Spring and Torsion Axles

Feature Spring Axles Torsion Axles
Cost Generally less expensive More expensive
Maintenance Requires regular maintenance Low maintenance
Ride Quality Good, but can be rough Smooth and quiet
Load Capacity Excellent for heavy loads Better for lighter loads
Installation Easier to install and replace More complex installation

Key Components

Regardless of the type, trailer axles have several key components:

  • Spindles: The ends of the axle where the wheels attach. They must be in good condition to ensure proper wheel alignment and function.
  • Hubs: These house the wheel bearings and attach the wheels to the axle.
  • Bearings: Critical for reducing friction and ensuring smooth wheel rotation.
  • Brakes: Often integrated into the hub, especially in trailers designed for heavy loads.

Understanding the differences between spring and torsion axles, and knowing the key components, will help you make an informed decision when selecting and replacing your trailer axle.

Next, we’ll dive into the step-by-step process of replacing your trailer axle, starting with the tools and materials you’ll need.

When to Consider Trailer Axle Replacement

Knowing when to replace a trailer axle is crucial for maintaining safety and performance. Here are some key signs that it’s time to consider trailer axle replacement:

Handling Issues

If your trailer starts to sway or handle poorly, it may be a sign of axle problems. Uneven tire wear, strange noises, or difficulty steering can all indicate that the axle is not functioning properly. These handling issues can compromise your safety on the road.

Cargo Loss

Axle problems can also lead to cargo loss. If the axle is damaged or misaligned, it can cause the trailer to tilt or bounce excessively, making it difficult to secure your load. This can result in shifted or lost cargo, especially on rough roads or during sharp turns.

Increased Resistance

Another sign that it’s time for a new axle is increased resistance. If you notice that your trailer is harder to tow or that your vehicle is struggling more than usual, the axle might be the culprit. Increased resistance can lead to higher fuel consumption and strain on your towing vehicle.

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By paying attention to these signs, you can address axle issues before they become major problems. In the next section, we’ll guide you through the step-by-step process of replacing your trailer axle, starting with the tools and materials you’ll need.

How to Choose the Right Trailer Axle

Choosing the right trailer axle is crucial for safety and performance. Let’s break it down into three main factors: diameter, load capacity, and track length.

Measure Diameter

First, measure the diameter of your existing axle. This is important because the new axle must fit your trailer’s current setup.

  1. Use a caliper: Measure the diameter of the axle tube. Standard sizes are usually 1.75″, 2″, or 3″.
  2. Check the spindle size: This is the part where the wheel hub attaches. Spindle size must match your existing hubs.

Load Capacity

The load capacity of your axle must support the maximum weight of your fully loaded trailer. Here’s how to figure it out:

  1. Gross Vehicle Weight Rating (GVWR): Find this number on the trailer’s identification plate or in the owner’s manual. It includes the weight of the trailer plus the maximum cargo weight.
  2. Divide by the number of axles: For trailers with multiple axles, divide the GVWR by the number of axles to get the minimum load capacity for each axle.

For example, if your trailer’s GVWR is 10,000 pounds and it has two axles, each axle should support at least 5,000 pounds.

Track Length

Track length is the distance between the centers of the tires on the same axle. Here’s how to measure it:

  1. From hub face to hub face: Measure the distance from one wheel hub’s mounting surface to the other. This is the most accurate method.
  2. From tire center to tire center: Measure the distance between the centers of the tires if you can’t access the hubs directly.

Additional Considerations

  • Spring Centers: Measure the distance between the centers of the leaf springs. This is crucial for proper alignment and fitment.
  • Axle Style: Choose between straight axles, drop axles, or torsion axles based on your trailer’s design and clearance needs.
  • Camber: Most axles are designed with a slight bend to ensure even tire wear when loaded. Make sure the axle you select has the appropriate camber for your trailer type.

By considering these factors, you can ensure that your new axle will fit perfectly and handle the load safely.

Next, we’ll dive into the step-by-step process of replacing your trailer axle, starting with the tools and materials you’ll need.

Step-by-Step Guide to Trailer Axle Replacement

Replacing a trailer axle might seem daunting, but with the right tools and a clear step-by-step guide, you can do it yourself. Let’s break it down.

Tools and Materials Needed

Before you begin, gather the following tools and materials:

  • Floor jack and jack stands: To lift and support the trailer.
  • Wrench set: For loosening and tightening bolts.
  • Impact driver or breaker bar: To remove lug nuts.
  • Mallet and punch: To tap out bolts.
  • Grease: For lubricating parts.
  • Safety gear: Gloves, safety glasses, and protective clothing.

Removing the Old Axle

  1. Safety First: Park your trailer on level ground. Ensure it’s secure by using wheel chocks.

  2. Jack Up the Trailer: Use a floor jack to lift the trailer by its frame. Follow the manufacturer’s specifications. Once lifted, support the trailer with jack stands.

  3. Remove the Wheels: Using an impact driver or breaker bar, remove the lug nuts and wheels from both sides of the trailer. Set them aside.

  4. Cut the Power and Ground Wires: If your axle has electric brakes, locate and cut the power and ground wires to avoid snagging during removal.

  5. Jack Up the Axle: Lift the axle beam at the center point using the floor jack. Place jack stands under the axle beam for support.

  6. Remove the Shackles: With the axle supported, remove the bolts securing the shackles to the leaf springs. Use a mallet and punch if necessary. Inspect the shackles for wear and replace if needed.

  7. Remove the Hanger Bolts: Follow the same procedure to remove the bolts securing the leaf springs to the hangers. Inspect and replace parts if necessary.

  8. Lower the Axle: Lift the axle at its center point again, remove the jack stands, and lower the axle to the floor. Slide it out from under the trailer.

Installing the New Axle

  1. Position the New Axle: Slide the new axle assembly under the trailer. Ensure it’s facing the correct direction (on Lippert axles, the ID tag should face the back). Rest it on the floor jack at its center point.

  2. Raise the New Axle: Slowly raise the axle into position using the floor jack. Make adjustments to align it with the mounting points. Support it with jack stands once in place.

  3. Attach the Hanger Bolts: Secure the leaf springs to the hangers with new bolts. Tighten them using your wrench set.

  4. Attach the Shackles: Align and secure the shackles to the leaf springs with new bolts. Tighten them properly.

  5. Reconnect Power and Ground Wires: If your axle has electric brakes, reconnect the power and ground wires.

  6. Install the Wheels: Place the wheels back on the hubs and secure them with lug nuts. Tighten the lug nuts using an impact driver or breaker bar.

  7. Lower the Trailer: Remove the jack stands and carefully lower the trailer to the ground using the floor jack.

  8. Wheel Alignment: Ensure the wheels are properly aligned. Misalignment can cause uneven tire wear and handling issues.

  9. Final Testing: Perform a road test to ensure everything is functioning correctly. Check for proper alignment and any unusual noises.

By following these steps, you can successfully complete a trailer axle replacement. This ensures your trailer is safe and ready for the road.

Next, we’ll cover essential maintenance tips to keep your new axle in top condition.

Maintenance Tips After Replacing Your Trailer Axle

Congratulations on completing your trailer axle replacement! Now, let’s talk about how to keep your new axle in top shape. Proper maintenance is key to ensuring the longevity and safety of your trailer. Here are some essential tips:


Keeping your axle and its components well-lubricated is crucial. Lubrication reduces friction and prevents overheating, which can lead to premature wear.

  • Use the Right Lubricant: Always use the lubricant recommended by the axle manufacturer. This ensures optimal performance and longevity.
  • Regular Lubrication: Make it a habit to lubricate the axle, bearings, and other moving parts regularly. This is especially important if you frequently tow your trailer.

Regular Checks

Regular inspections can help you catch potential issues before they become serious problems.

  • Visual Inspections: Look for signs of wear and tear, such as rust, cracks, or other damage. Pay special attention to the axle, leaf springs, and shackles.
  • Listen for Unusual Noises: Grinding or squeaking sounds can indicate problems. Address these issues immediately to avoid further damage.
  • Check for Vibration: Excessive vibration can be a sign of misalignment or bearing issues. If you notice this, inspect the axle and alignment.

Bearing Repacking

Bearings are critical for smooth axle operation. Over time, they can become worn or contaminated, so regular repacking is essential.

  • Clean and Inspect Bearings: Remove the bearings, clean them thoroughly, and inspect for any signs of wear or damage.
  • Repack with Grease: Use high-quality grease to repack the bearings. This ensures they stay lubricated and function properly.
  • Reassemble Carefully: Make sure to reassemble the bearings and axle components correctly to avoid any issues down the road.

By following these maintenance tips, you can ensure your new axle remains in excellent condition, providing you with safe and reliable towing.

Next, we’ll answer some frequently asked questions about trailer axle replacement.

Frequently Asked Questions about Trailer Axle Replacement

How do I know what trailer axle to buy?

Choosing the right trailer axle involves a few key steps:

  1. Measure the Diameter: Accurately measure the diameter of your current axle. This ensures the new one will fit properly.
  2. Determine Load Capacity: Check the weight capacity of your trailer. Your new axle must support this weight.
  3. Track Length: Measure the distance between the centers of the wheels on either side of the trailer (track length). This helps in aligning the new axle correctly.

Make sure to double-check all specifications to avoid mismatches. If in doubt, consult your trailer’s manual or contact a professional for guidance.

Can you swap axles on trailers?

Yes, you can swap axles on trailers. Replacing a damaged or worn-out axle can extend the life of your trailer and improve its performance. However, ensure the new axle matches the specifications of your trailer’s suspension and load requirements.

Swapping axles involves:

  • Removing the Old Axle: Safely lift the trailer, remove the wheels, and detach the old axle.
  • Installing the New Axle: Align the new axle correctly, bolt it in place, and test for proper alignment and function.

If you’re not comfortable with DIY repairs, hiring a professional is always a good option.

What are the two types of trailer axles?

Trailer axles generally come in two types:

  1. Spring Axles: These use leaf springs to absorb shocks and provide a smooth ride. They are common in many trailers due to their durability and ease of maintenance.

  2. Torsion Axles: These have a rubberized suspension system inside the axle tube, offering a smoother ride and better handling. They are typically used in higher-end trailers.

Each type has its advantages. Spring axles are easier to repair and often cheaper, while torsion axles provide a quieter and smoother ride but can be more expensive to replace.

By understanding these FAQs, you can make informed decisions about your trailer axle replacement, ensuring a smoother, safer towing experience.


Replacing your trailer axle is not just about getting your trailer back on the road. It’s about ensuring longevity and safety for every trip you take. A well-maintained axle can prevent costly repairs down the line and give you peace of mind knowing your trailer is in top condition.


Regular maintenance and timely replacements extend the life of your trailer. By following our step-by-step guide and using quality parts, you ensure that your trailer remains functional for years to come. Routine inspections and upkeep, such as lubricating the spindle and bearings, can significantly reduce wear and tear.


Safety is paramount when it comes to towing. A faulty axle can lead to handling issues, cargo loss, or even accidents. Replacing a worn-out axle ensures that your trailer maintains proper alignment and stability, making your journeys safer. Regular checks for unusual noises, excessive vibrations, and visual damage can help catch issues early, preventing more significant problems.

MZI Precision

At MZI Precision, we specialize in ensuring your trailer operates safely and efficiently. Our experts can guide you through the entire trailer axle replacement process, offering professional insights and top-notch services. Trust us to help keep your trailer running smoothly, minimizing downtime and maximizing performance.

By following these maintenance tips and leveraging our expertise, you can ensure that your trailer remains in prime condition, ready for whatever the road throws your way. Regular maintenance, combined with professional insights, is your best strategy for extending the life of your trailer and its components.

For more information on our services and to explore how we can assist you, visit our service page. Let us help you steer your way to a smoother and more reliable towing experience.