A Guide to the 2007-2016 Lexus RX350 Rear Suspension Trailing Arm
Stop annoying squeaks and clunks from the rear of your RX350 by understanding this common suspension issue.
- The most common failure is the rubber bushing, which causes squeaking and clunking noises from the rear.
- A known issue is documented in a Lexus TSB for the 2016 model, involving an updated part to fix the noise.
- Replacing the entire arm is the standard repair; always replace them in pairs for balanced performance.
- A four-wheel alignment is mandatory after replacement to prevent rapid tire wear.
Is Your Lexus RX350 Making Strange Rear-End Noises?
If you're hearing a squeaking, creaking, or clunking sound from the back of your 2007-2016 Lexus RX350, a failing suspension trailing arm bushing is a likely culprit. This issue is so common that Lexus issued a Technical Service Bulletin (TSB) for the 2016 model year, though the problem affects the entire 2007-2016 generation. The noise often gets worse in colder weather or when driving over uneven roads. While the steel arm itself rarely fails without an accident, its rubber bushings wear out, causing noise and handling problems.
Symptoms of a Bad Trailing Arm
Pay attention to these signs that your trailing arms need inspection:
- Squeaks and Creaks: An annoying squeaking or groaning noise from the rear suspension, often described as sounding like an old bus, is the most common symptom. You'll likely hear it over speed bumps or when the vehicle body moves as you come to a stop.
- Clunking Noises: A thud or clunk from the rear when you accelerate, brake, or go over bumps can point to worn-out bushings.
- Unstable Handling: The vehicle may feel like it's wandering or swaying from the rear, forcing you to make constant steering corrections to drive straight.
- Uneven Tire Wear: When the bushings fail, the rear wheel alignment can be thrown off, causing your rear tires to wear out quickly and unevenly.
Known Issue: Technical Service Bulletin L-SB-0030-19
For the 2016 RX350 (and newer models up to 2019), Lexus released a TSB to address a squeaking noise from the rear trailing arm bushings. The official fix is to replace the entire trailing arm assembly with an updated part. While this TSB only officially covers the 2016 model in your year range and was intended for vehicles under warranty, it confirms that bushing failure is a known issue with the original factory parts.
Choosing the Right Aftermarket Trailing Arm
Since the entire arm assembly is replaced, choosing a quality part is important. The quality of aftermarket suspension parts can vary greatly. Here’s a breakdown of the available brands:
- Premium Brands (Moog, Delphi): These brands are generally considered high-quality, often designed to meet or exceed original equipment (OE) standards. Moog is a well-known name chosen by many professionals for its durability. While they are at the higher end of the aftermarket price range, they are a solid choice for long-term reliability.
- Mid-Range Brands (Mevotech): Mevotech aims to balance quality and cost. They are a good option for a daily-driven vehicle, offering acceptable performance and durability for the price.
- Economy Brands (Dorman): Dorman offers a wide range of parts at budget-friendly prices. While they can be a cost-effective solution, some users report their longevity may not match premium brands. For this specific part, some forum members have expressed strong opinions against using lower-cost brands, citing poor quality.
Pro Tip: Given that labor can be a significant part of the replacement cost, spending a little more on a premium aftermarket or OEM part can save you from having to do the job a second time.
How Much Does a Trailing Arm Replacement Cost?
The total cost will depend on the parts you choose and local labor rates. A professional alignment is required after the job is done.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part (Single) | $43 - $129 |
| New OEM Part (Single) | $250 - $300 |
| Shop Labor (per side) | $180 - $270+ |
| Wheel Alignment | $100 - $200 |
Note: Labor costs can increase significantly if bolts are seized or if your vehicle has the specific subframe design that makes one of the mounting bolts very difficult to access.
Frequently Asked Questions
Should I replace trailing arms in pairs?
Yes, it is highly recommended. If the bushing on one side has failed due to age and wear, the other side is likely not far behind. Replacing both at the same time ensures balanced handling and saves you a future repair bill.
Can I just replace the bushing instead of the whole arm?
While bushings are available separately, the standard and recommended repair procedure is to replace the entire trailing arm assembly. Pressing old bushings out and new ones in requires special tools and adds significant labor, often making it more cost-effective to replace the complete arm which comes with new bushings pre-installed.
Do I need a wheel alignment after replacing a trailing arm?
Yes, absolutely. The trailing arm is a key part of your rear suspension geometry. Replacing it will affect the alignment. A four-wheel alignment is necessary to ensure proper handling and prevent premature tire wear.
Is this a difficult DIY job?
For an experienced DIY mechanic with the right tools, it can be straightforward. The arm is held on by a few bolts. However, on some RX350s, one of the forward mounting bolts is blocked by the subframe or engine mount, which can turn a simple job into a very difficult one requiring the engine to be lifted. Be sure to inspect your vehicle's specific configuration before starting.
Helpful Videos
Technical Specifications
OEM Part Numbers: 48780-0E010 48780-48050 48780-0E061 48780-48091 48780-0E080 48760-0E010 48760-48030 48760-0E051 48760-48061 48760-0E070
The trailing arm for the 2007-2016 Lexus RX350 is a stamped steel, non-adjustable arm that controls the longitudinal (front-to-back) position of the rear wheel. It includes pre-installed rubber bushings at both mounting points. The arm itself is coated for corrosion resistance.
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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 RX350:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Lexus RX350 Making Strange Rear-End Noises?
- Symptoms of a Bad Trailing Arm
- Known Issue: Technical Service Bulletin L-SB-0030-19
- Choosing the Right Aftermarket Trailing Arm
- How Much Does a Trailing Arm Replacement Cost?
- Frequently Asked Questions
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