A Guide to Replacing the Rear Lateral Arm on a 1997-2005 Buick Century
Fix rear-end clunks and wandering to restore your Century's smooth, stable ride.
- A clunking noise from the rear and a wandering sensation are the most common signs of a bad lateral arm.
- A four-wheel alignment is mandatory after replacement to prevent tire damage and ensure safety.
- Rust is the biggest challenge in this repair; seized bolts can turn a simple job into a difficult one.
- Aftermarket brands like Dorman and Mevotech are cost-effective and reliable choices for this repair.
Is Your Buick Century's Rear End Making Noise?
If you're hearing clunking or thumping sounds from the back of your 1997-2005 Buick Century, especially when going over bumps or turning 🎬 Watch: Diagnosing common Buick suspension noises and vibrations, a worn-out lateral arm could be the culprit. These arms have rubber bushings at each end that wear down over time. When the bushings fail, the metal arm can move excessively and knock against its mounting points. In severe cases, especially on vehicles with rust, the arm itself can break, causing a serious handling problem.
Symptoms of a Failing Lateral Arm
- Clunking or Popping Noises: The most common symptom is noise from the rear suspension when driving over uneven roads or bumps.
- Loose or Wandering Rear End: The car may feel unstable, as if the rear is swaying or steering on its own. This can be especially noticeable during turns.
- Uneven Tire Wear: A bad lateral arm allows the rear wheel alignment to change, which can cause the inside or outside edge of the rear tires to wear out prematurely.
A Note on Rust
Vehicles in the rust belt are prone to severe corrosion of suspension components. Before ordering parts, inspect the lateral arms and the subframe mounting points for heavy rust. A broken lateral arm is a significant safety issue. Severely rusted bolts can make this repair much more difficult and may require cutting tools for removal.
Choosing the Right Aftermarket Lateral Arm
For a vehicle like the 1997-2005 Century, aftermarket parts offer a great balance of quality and value. Original GM parts are often expensive and unnecessary for a car of this age. The two main brands you'll likely encounter are Dorman and Mevotech.
| Brand Tier | Brands | Quality & Notes |
|---|---|---|
| Standard Replacement | Dorman, Mevotech | Both Dorman and Mevotech are considered reliable standard replacement options for this vehicle. Dorman is known for being a direct, easy-to-install replacement, while Mevotech sometimes offers design improvements. Some aftermarket arms for this car include a grease fitting for easier maintenance, a feature the original part lacked. For daily driving, either brand will restore original performance and safety. |
Estimated Replacement Costs
The cost to replace a lateral arm depends on whether you do it yourself or use a repair shop. Remember, a wheel alignment is required after the job is done.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Lateral Arm (1) | $39.62 - $52.03 |
| Shop Labor | $100 - $225 |
| Wheel Alignment (Required) | $80 - $150 |
| Total Professional Repair (One Side) | $220 - $427 |
Pro Tip: Replace in Pairs
Suspension components wear out at a similar rate. If one lateral arm has failed, the one on the other side is likely not far behind. It's recommended to replace them in pairs to ensure balanced handling and to avoid doing the same job twice.
Frequently Asked Questions (FAQ)
Can I replace just one lateral arm?
Yes, you can replace just the one that has failed. However, it is best practice to replace suspension parts in pairs (both left and right sides) to maintain balanced handling and predictable performance.
Do I need a wheel alignment after replacing a lateral arm?
Yes, absolutely. The lateral arm is a key part of your rear suspension's geometry. Replacing it will affect the alignment. You must get a four-wheel alignment after the repair to prevent rapid tire wear and ensure the vehicle drives straight.
Is this a difficult job to do at home?
The difficulty depends heavily on rust. If the bolts are clean, it's a relatively simple bolt-off, bolt-on procedure for a DIY mechanic with the right tools. However, if the bolts are seized with rust, they may need to be cut off with a torch or angle grinder, which significantly increases the difficulty. In some cases, the rear subframe must be slightly lowered to access the inner bolts.
What are the different arms in the rear suspension?
The rear suspension on the Century has multiple links. There are typically two lateral arms per side (forward and rearward) and one trailing arm that runs front-to-back. It's important to correctly identify which arm has failed before ordering 🎬 See this walkthrough for replacing rear lateral and trailing arms a replacement.
Helpful Videos
Technical Specifications
OEM Part Numbers: 10257356 10403369 10289772
The 1997-2005 Buick Century uses a multi-link rear suspension. Each side typically has a forward and a rearward lateral arm. These are non-adjustable arms with rubber bushings pressed in at both ends. Some aftermarket replacements may include grease fittings.
We Have This Part in Stock
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.
- Buick Century: