Strut Rod Bushing for 2005 Nissan 350Z Track

A strut rod runs forward from the lower control arm to a chassis mounting point, and a single bushing at that end absorbs everything the brakes generate at that wheel.

It is one of the hardest working bushings on your Nissan 350Z's front suspension, and it is usually the first one to give up.

What the Strut Rod Actually Holds

On a front suspension using a lower control arm with a single inner pivot, that arm can swing fore and aft as well as up and down.

Left unchecked it would do exactly that under braking, pulling the wheel backward and changing the geometry every time you slowed down.

The strut rod is what stops it happening. One end bolts to the outer part of the lower arm, the other runs forward or rearward to a bracket on the chassis, and between them they triangulate the arm so it can only move in the plane it is supposed to.

Depending on the manufacturer and the era, the same component is called a tension rod, a compression rod or a radius rod. A radius rod bushing and a strut rod bushing are the same part under different names, which is worth knowing when searching.

Why the Bushing Works in Compression

The loading here is different to most suspension bushings and it explains the failure mode.

Under braking the wheel tries to move rearward. That pushes or pulls the strut rod along its length, and the entire force arrives at the chassis bushing as a straight push or pull rather than as a twisting load.

Most designs sandwich the bushing between washers with the rod passing through the center, so the rubber is squeezed hard between the washer and the bracket on every brake application.

Repeated compression is what eventually kills a rubber bushing. It hardens, loses thickness and eventually splits or extrudes out past the washers, and at that point the rod has free play along its own axis.

That is why these wear out on a schedule while other bushings on the same car are still serviceable.

Brake Shudder and the Wheel That Moves

The signature symptom is specific enough to diagnose from the driver's seat.

With play in the bushing, the lower arm can move fore and aft under braking. The wheel shifts backward slightly as you apply the brakes and springs forward as you release.

That produces a shudder or judder felt through the steering wheel under braking, and it gets misdiagnosed as warped brake rotors more often than almost any other suspension fault.

The distinction between the two is straightforward enough to make. Rotor judder is rhythmic and tied to wheel speed, so it pulses faster as you brake from higher speeds. Bushing shudder is a single shake or lurch that arrives as the brakes bite and does not pulse.

Clunking over bumps follows, and so does a car that pulls under braking when one side has gone further than the other.

Caster Moves With the Rod

This is the part most people miss, and it affects how the car steers rather than just how it brakes.

The strut rod sets how far forward or back the bottom of the hub sits. Move that point and you rotate the steering axis, which is caster.

A collapsed bushing lets the arm sit further rearward than designed, which reduces caster on that side. Less caster means weaker self centering, lighter steering on center and a car that wanders.

Worse than that, it rarely happens evenly across the car. One bushing further gone than the other gives different caster left to right, which produces a persistent pull that no amount of alignment adjustment will fix while the bushing is still moving.

An alignment shop measuring caster on a car with worn strut rod bushings is measuring a number that changes the moment the car is driven.

Why Nissan 350Z Strut Rod Bushings Fail Before Other Bushings

Three things combine to shorten their life and they are specific to this position.

Compression loading is the first of those three. A bushing being squeezed between washers on every brake application has no opportunity to recover the way a pivoting bushing does.

Heat is the second factor working against them. The strut rod mounting sits close to the brakes on many designs, and heat soaking through accelerates rubber degradation.

Exposure to the elements is the third and final one. The chassis bracket sits low at the front of the car directly in the path of road spray, salt and grit, with no shielding and nothing to keep water out of the joint.

Add vehicle age to that, since this suspension layout is most common on older cars, and the bushings have usually been working for decades rather than years.

That combination is why a car can present with perfectly serviceable control arm bushings and completely destroyed strut rod bushings on the same axle.

Checking Them Without Removing Anything

A few checks separate this from the faults it gets confused with.

Have someone apply the brakes firmly while the car is on a hoist with the wheels able to turn, and watch the lower arm at the strut rod. Visible fore and aft movement means the bushing is gone.

Look at the bushing stack directly for rubber bulging past the washers, which is the usual failure, or for gaps where material has broken away entirely.

Lever the lower arm fore and aft with the suspension unloaded. Any movement at the strut rod end is play that should not be there.

Compare both sides, since uneven wear is what produces the pull under braking and finding one side worse tells you which is causing it.

Check the rotors before buying parts if the complaint is shudder, so you know which of the two you are chasing.

Washers, Sleeves and the Stack

The hardware around the bushing matters as much as the bushing.

Most arrangements use a bushing either side of the chassis bracket with large washers outboard of each, and a nut drawing the whole stack together along the rod.

Those washers spread the load across the face of the rubber. Undersized, corroded or dished washers let the bushing extrude past them, which is why a replacement bushing fitted against old washers often fails quickly.

The sleeve or spacer between the bushings sets how much the stack can be compressed. Without it, tightening the nut crushes the rubber rather than clamping the assembly, which destroys the new bushing on installation.

Check the rod itself for wear where the bushings sit. A rod that has been working against a failed bushing often has a groove or corrosion at that point, and a new bushing on a worn rod wears quickly.

Adjustable Strut Rods

Where the rod length can be altered, caster becomes adjustable.

Threaded or adjustable strut rods let the lower arm be moved fore and aft deliberately, which sets caster on platforms that offer no factory adjustment at all.

That matters on older performance cars where the factory never provided a way to correct caster, and on anything lowered where the geometry has moved from standard.

Adjustment is made with the car at ride height and set properly on an alignment rack, since caster affects steering feel directly and guessing produces a car that fights you.

Firm bushings matter more on an adjustable rod than a fixed one, since the whole point of setting a caster figure is having it stay where you put it.

Replacing Them Properly on Your Nissan 350Z

Access is usually straightforward compared with most bushing work, which is the good news.

The nut at the chassis end draws the stack together, and it has often been exposed to road spray for decades. Penetrating fluid applied in advance saves a lot of effort.

Note the position of every washer, sleeve and spacer as it comes off. The stack has to go back in the same order, and the sequence varies between designs.

Replace the bushings in pairs across the car. One firm and one collapsed gives different caster left to right, which is the exact fault you are trying to fix.

Torque the nut with the suspension at ride height rather than hanging, since the bushing takes its set from the position it is clamped in.

Have the alignment checked afterward, because caster has moved whether you intended it to or not.

Find Strut Rod Bushings for Your Nissan 350Z

Strut rod bushings are part of our bushings lineup. Doing the lower arm too? Add control arm bushings.

Select your Nissan 350Z to see the strut rod bushing kit options available for it, and check a strut rod bushing diagram for your application if you are unsure how the stack assembles. If the car shudders under braking and the rotors have already been checked, the strut rod bushings are the next place to look.