Buick LeSabre Rear Lateral Arm Guide (1978-1987)
Keep your classic LeSabre's rear end stable and quiet by understanding the lateral arm.
- The lateral arm (or panhard rod) is essential for keeping the rear axle centered on your 1978-1987 LeSabre.
- Symptoms of failure include clunking noises from the rear, a wandering or loose feeling, and poor handling.
- Dorman is the main aftermarket brand available, offering a cost-effective and reliable replacement for the original part.
- Replacement is a straightforward DIY job for most home mechanics, typically requiring only basic tools.
Symptoms of a Failing Lateral Arm
The original lateral arm on a 1978-1987 LeSabre can wear out, especially the rubber bushings at each end. When these bushings degrade or the arm itself is damaged, you'll likely notice some distinct problems. These symptoms indicate the axle is no longer held firmly in place.
Common Failure Symptoms:
- Clunking or Thumping Noises: A common sign is a clunking sound from the rear of the car, especially when going over bumps or making turns. This is the sound of the loose arm moving and hitting its mounting points.
- Wandering or Loose Rear End: You might feel the back of the car swaying or feeling disconnected from the rest of the vehicle, particularly at higher speeds or on uneven roads. This instability is a direct result of the axle shifting from side to side.
- Poor Handling: As the rear axle shifts, the car's handling can become unpredictable, making it feel less stable and secure during turns.
- Uneven Tire Wear: While less common than other symptoms, a misaligned rear axle can sometimes contribute to unusual wear patterns on the rear tires.
Choosing the Right Aftermarket Lateral Arm
For a classic vehicle like the 1978-1987 LeSabre, finding original GM parts is nearly impossible. New Old Stock (NOS) parts are rare and expensive. The aftermarket is the most practical source for a replacement lateral arm.
Brand Focus: Dorman
Currently, Dorman is the primary aftermarket manufacturer for this specific part. Dorman produces replacement parts that are designed to be direct-fit replacements for the original equipment. For a simple, sturdy part like a lateral arm, Dorman is generally considered a reliable factory replacement. The part consists of a solid steel bar with bushings, which is a straightforward component to manufacture. Reviews for Dorman suspension parts are often mixed, but many users find them to be a good value for standard repairs, especially when compared to the difficulty of finding original parts. The Dorman replacement will restore the original function and stability to your rear suspension.
Pro Tip: Check the Bushings
The most common failure point of a lateral arm is the bushings, not the steel bar itself. When you replace the arm, you are also replacing these crucial wear items, which is why a full replacement is often recommended over pressing in new bushings.
Replacement Cost
The cost to replace a lateral arm on your LeSabre is very reasonable, especially if you can do the work yourself. The part is affordable, and labor is straightforward.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Lateral Arm (Dorman) | $59.63 |
| Shop Labor | $100 - $200 |
| Total Estimated Cost | $160 - $260 |
Frequently Asked Questions (FAQ)
What is the difference between a lateral arm and a control arm?
A lateral arm (or panhard rod) controls side-to-side movement of the axle. Control arms (or trailing arms) on your LeSabre's rear suspension control the front-to-back movement of the axle. Your car has both, and they work together to keep the axle located properly.
Is replacing the lateral arm a DIY job?
Yes, for most home mechanics with a decent set of tools, this is a very feasible DIY job. It typically involves removing two bolts, one at each end of the arm. You will need to safely lift and support the rear of the vehicle on jack stands. Rust on the bolts can be the biggest challenge on a vehicle of this age.
Are there any recalls for the lateral arm on a 1978-1987 LeSabre?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not find any recalls or technical service bulletins (TSBs) specifically for the lateral arm on this generation of Buick LeSabre.
Should I replace any other parts at the same time?
While you are working on the rear suspension, it's a good idea to inspect the other suspension components. Check the condition of the upper and lower control arm bushings, the coil springs, and the shock absorbers. Since all these parts are of the same age, they may also be nearing the end of their service life.
Technical Specifications
This part is also known as a Panhard Rod or Track Bar. It is a single steel bar with rubber or polyurethane bushings at each end, connecting the solid rear axle to the vehicle's frame.
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.