2003 Toyota Highlander Rear Trailing Arm Suspension Bushings Part Number Guide

The rear trailing arm bushings on a 2003 Toyota Highlander play a critical role in maintaining proper rear suspension geometry and ride quality. Over time, these bushings wear out, leading to clunking noises, vague handling, and uneven tire wear. If you're searching for the correct part number to replace them, this guide will help you identify the right components and make an informed purchase.

Symptoms of Worn Rear Trailing Arm Bushings

Before ordering new bushings, confirm that they are indeed the source of your Highlander's symptoms. Common indicators include:

• Clunking or popping sounds from the rear when accelerating, braking, or going over bumps.
• Vague or loose rear-end feel during cornering.
• Excessive rear wheel movement when the vehicle is jacked up and the wheel is pushed/pulled.
• Uneven tire wear on the rear tires, often scalloped or cupped.

If you experience any of these, inspect the trailing arm bushings visually. They are located at the forward end of the trailing arm where it attaches to the chassis. Cracks, tears, or separation of the rubber from the metal sleeve indicate replacement is needed.

Identifying the Correct Part Number

For the 2003 Toyota Highlander, there are two trailing arms per side (left and right), each with a bushing at the chassis mount. The exact part number depends on whether you have the 2WD or 4WD version, as well as the trim level. However, many aftermarket options cover multiple configurations.

OEM Part Numbers

Toyota originally used the following part numbers for the rear trailing arm bushing:

• 48709-48010 – Right side (passenger side)
• 48710-48010 – Left side (driver side)

These are the official Toyota parts for the 2003 Highlander with either 2WD or 4WD. Each bushing is sold as a separate component. You can order them from a Toyota dealership or any genuine Toyota parts retailer.

Aftermarket Options

Several aftermarket manufacturers produce equivalents that meet or exceed OEM quality. Common brands include:

• Moog – Known for durable rubber bushings with greasable options.
• Beck/Arnley – Offers OEM-quality replacements.
• ACDelco – Provides professional-grade parts.
• Energy Suspension – Makes polyurethane bushings for improved handling, but note they can increase NVH.

When selecting aftermarket bushings, cross-reference your vehicle's VIN with the manufacturer's catalog to ensure fitment. Many aftermarket bushings are sold as a set of two, but always verify.

How to Verify Compatibility

To avoid ordering the wrong part:

1. Check your vehicle's build date – The 2003 model year ran from mid-2002 to mid-2003. Early and late production may have slight variations.
2. Look up by VIN – Use Toyota's online parts catalog or a reputable parts store's VIN checker.
3. Inspect the old bushing – Measure the outer diameter of the metal sleeve and the inner diameter of the bolt hole. Common sizes are around 40 mm outer diameter with a 12 mm bolt hole.
4. Consult with a parts specialist – Call a local auto parts store or Toyota dealership with your VIN to confirm.

Replacement Considerations

Replacing trailing arm bushings is an intermediate-level DIY job but requires proper tools and safety precautions.

Tools Needed

• Jack and jack stands
• Lug wrench
• Socket set including 21 mm or 22 mm for the trailing arm bolts
• Torque wrench
• Bushing press or a large C-clamp with sockets
• Penetrating oil (e.g., PB Blaster)

Difficulty Level

If the bushings are rusted or seized, removal can be challenging. Many DIYers opt to remove the entire trailing arm to press out the old bushing on a bench. Alternatively, some aftermarket bushings can be installed without removal using a special tool, but access is tight.

Alignment After Replacement

Replacing rear trailing arm bushings will alter the rear wheel alignment, especially toe and camber. A professional alignment is strongly recommended after the job. Without it, you may experience premature tire wear and poor handling.

Final Recommendation

For a 2003 Toyota Highlander, the OEM bushings (part numbers 48709-48010 and 48710-48010) are the safest choice. They are designed to provide a balance of comfort and durability that matches the vehicle's original performance. If budget is a concern, high-quality aftermarket brands like Moog or Beck/Arnley are reliable alternatives. Avoid no-name or cheap bushings, as they often fail prematurely.

Always replace both sides at the same time to maintain even wear and handling. After installation, get the rear alignment checked to ensure everything is within specifications. With the correct parts and proper installation, your Highlander's rear suspension will perform like new for many miles.