Guide to Replacing Lateral Arms on the 2006-2008 Lexus RX400h
Address clunking noises and sloppy handling by understanding when to replace your RX400h's rear lateral arms.
- A clunking noise from the rear over bumps is the most common symptom of a failing lateral arm.
- Always get a wheel alignment immediately after replacing lateral arms to prevent uneven tire wear.
- Replacing the entire arm assembly is more efficient than just pressing in new bushings.
- Aftermarket brands like Dorman and Mevotech offer a significant cost saving over OEM parts for this repair.
Is Your RX400h Making Noise? It Could Be the Lateral Arms
If you're hearing clunking or rattling sounds from the back of your Lexus, especially when going over bumps, you might have a failing lateral arm. These parts are essential for a smooth, stable ride. Over time, the rubber bushings wear out, or the arm itself can get damaged, leading to noticeable problems.
Key Symptoms of a Failing Lateral Arm:
🎬 Watch this video to identify common signs of suspension failure.- Clunking or Knocking Noises: This is the most common sign. Worn bushings allow metal parts to hit each other, creating a distinct clunking sound from the rear suspension.
- Loose or Unstable Steering: You might feel the rear of the vehicle is unstable or "loose," particularly when turning. This happens because the worn arm can no longer hold the wheel securely in alignment.
- Uneven Tire Wear: A bad lateral arm can throw off your vehicle's alignment, causing the inside or outside edge of your rear tires to wear down much faster than the rest.
Known Issues for the 2006-2008 Lexus RX400h
While there are no specific recalls or Technical Service Bulletins (TSBs) for the lateral arms on the RX400h, the bushings on these suspension components are a known wear item. Owners on forums frequently discuss the bushings cracking or splitting, which leads to the need for replacement. The bolts securing the arms can also seize due to rust, making removal difficult. It's common for mechanics to recommend replacing the entire arm rather than just pressing in new bushings, as it's often more labor-efficient.
Choosing an Aftermarket Lateral Arm: Dorman vs. Mevotech
When replacing your lateral arms, you don't have to buy expensive OEM parts from the dealer. Aftermarket brands offer a cost-effective alternative. For the RX400h, Dorman and Mevotech are two common choices.
- Dorman: Dorman is known for providing a wide range of affordable replacement parts that are designed to be easy to install. They are a budget-friendly option that provides decent performance for daily driving. However, some users report their longevity may not match more premium brands.
- Mevotech: Mevotech is often seen as a good balance between quality and price. They focus on suspension components and are known for innovative designs. While generally considered reliable for daily use, some online discussions suggest quality can be inconsistent.
Pro Tip: Both Dorman and Mevotech are considered value-driven brands. For a daily-driven luxury vehicle like the RX400h, either brand should provide a satisfactory replacement for a worn-out original part. The decision often comes down to price and availability. Since the job requires a wheel alignment afterward, it's best to replace both sides at the same time for balanced performance.
Cost of Replacing Lateral Arms on a 2006-2008 Lexus RX400h
The cost can vary based on your location and whether you do the work yourself or hire a professional. Here is a general breakdown:
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Lateral Arm (Single) | $43 - $60 |
| Shop Labor (Per Side) | $150 - $250 |
| Wheel Alignment (Required) | $100 - $200 |
| Total Professional Replacement (Both Sides) | $486 - $820 |
*Cost estimates are for informational purposes only and may vary.
Frequently Asked Questions
Do I need to replace the whole lateral arm or just the bushings?
While you can sometimes buy bushings separately, it is almost always more practical and cost-effective to replace the entire lateral arm assembly. Pressing old bushings out and new ones in requires special tools and extra labor, which can quickly exceed the cost of a new arm that already includes new bushings.
Should I replace lateral arms in pairs?
Yes. It is highly recommended to replace lateral arms in pairs (both left and right sides). If one side has failed due to age and wear, the other side is likely not far behind. Replacing both ensures balanced handling and saves you from having to do the same job twice.
Is a wheel alignment necessary after replacing lateral arms?
Yes, a four-wheel alignment is absolutely necessary after replacing lateral arms. These arms are a key part of your vehicle's alignment angles. Skipping the alignment will result in poor handling and rapid, uneven tire wear.
Are there different lateral arms for the front and back of the RX400h?
Yes. The term "lateral arm" or "lateral link" almost always refers to components in the rear suspension. The front suspension uses parts called "lower control arms," which are different in design and function. This guide focuses on the rear lateral arms.
Are there any recalls for the RX400h suspension?
No, there are no recalls specifically for the lateral arms or control arms on the 2006-2008 Lexus RX400h. Recalls for this vehicle have focused on other issues like the hybrid inverter module and accelerator pedal interference.
Helpful Videos
Technical Specifications
OEM Part Numbers: 48710-0E020 48710-48050
The rear suspension on the 2006-2008 RX400h uses multiple lateral arms per side, often referred to as rear lower forward and rear lower rearward arms. These are typically made of steel and are not adjustable. They come with pre-installed rubber bushings.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus RX400h:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your RX400h Making Noise? It Could Be the Lateral Arms
- Key Symptoms of a Failing Lateral Arm:
- Known Issues for the 2006-2008 Lexus RX400h
- Choosing an Aftermarket Lateral Arm: Dorman vs. Mevotech
- Cost of Replacing Lateral Arms on a 2006-2008 Lexus RX400h
- Frequently Asked Questions
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