How to Diagnose Sway Bar Bushings on a Lift

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A clunk from the front over bumps can come from half a dozen parts, and the sway bar bushings are one of the easiest to check. With the car on a lift, a pry bar and a flashlight, you can confirm whether the bushings are the source of the noise in five minutes. The test saves a trip to the shop and avoids replacing parts that are not the problem.

What the driver feels

A clunk over expansion joints and railroad crossings.
A squeak over small bumps that is worse in cold weather.
A vague feel in corners with more body roll.
A noise from the subframe or frame rail area.
The car wanders on the highway.
Visible cracks on the rubber bushings.
A clunk when going over speed bumps.
Uneven tire wear on the front shoulders.

The five-minute lift test

The sway bar bushings are accessible from under the car. On a Honda Accord or Toyota Camry, the bar runs across the subframe and is held by two clamps, one on each side. With the car on a lift, you can see and touch both bushings without removing anything. A pry bar lets you move the bar and see whether it has play in the clamps.

The test is straightforward. On a Ford F-150 or Chevrolet Silverado, prying up on the sway bar at the bushing shows whether the bar moves inside the clamp. A good bushing holds the bar tight, with no visible movement. A worn bushing lets the bar shift, and you can see and feel the gap. This is the same test a technician does, and it does not require special tools.

Step-by-step inspection

Raise the car on a lift or jack stands so the front wheels hang freely.
Locate the sway bar running across the subframe, and find the two bushing clamps.
Inspect the rubber bushings visually for cracks, splits or compression.
Insert a pry bar under the sway bar and pry up firmly: watch for movement inside the clamp.
Compare left and right: the side with visible movement has a worn bushing.
Safety note: Support the car on rated jack stands at the frame, never on the floor pan.
Check the clamp bolts for tightness, because a loose bolt also lets the bar move.
Wiggle the sway bar links at the same time, because they also clunk and wear together.

What to do next

If the bushings are cracked or have play, replace both sides on the same bar.
If the clamps are loose, torque them to specification and see if the clunk goes away.
If the links are also worn, replace them at the same time.
Grease the new bushings before installation to prevent squeaking.
After the job, road test on a rough road to confirm the clunk is gone.