Radius Arm Bushings for 1996 Nissan 240SX Base

On your Nissan 240SX, a radius arm bolts to the axle in two places, and that single detail decides everything about how its bushings live and die.

One arm, two axle mounts, one chassis pivot. The arm resists axle rotation through its own structure rather than sharing the job with a second link.

What Is a Nissan 240SX Radius Arm

A radius arm is a long, heavy arm running fore and aft between the axle housing and a chassis mounting point.

Unlike a trailing or leading arm that picks up the axle at a single point, a radius arm bolts to the axle at two separate locations, usually spaced vertically apart on the housing.

That spacing between the two is the whole design. Two mounting points a distance apart mean the arm can resist the axle trying to rotate, without needing an upper link above it to do that job.

At the chassis end it pivots on a single large bushing, which is where the arm's whole arc happens.

Radius arm suspension is most common on solid front axles, where it has to control fore and aft position, axle rotation and caster all at once.

Radius Arm vs 4 Link Suspension

The comparison comes up constantly and the trade is straightforward.

A 4 link setup uses two arms per side, an upper and a lower, positioned at different heights. Between them they control axle rotation, and because they are separate links, each one can pivot freely as the suspension moves.

A radius arm does the same job with one arm and two axle bolts. It is simpler, lighter on parts, and considerably easier to package.

The cost of that simplicity comes in articulation. Two links at different heights can each follow their own arc. A single rigid arm bolted at two points cannot, so as the axle moves through its travel the arm has to twist, and the bushings have to absorb what the geometry cannot.

A 4 link articulates better and takes more space, more brackets and more bushings. A radius arm is tidier, stiffer and more compromised at the extremes of travel.

For a road going or lightly used vehicle, the radius arm is a sound engineering choice. For something built around maximum articulation, 4 link conversions exist for exactly this reason.

Why Nissan 240SX Radius Arm Bushings Take More Load Than Most

Scale is worth understanding before treating these as ordinary bushings.

A solid front axle is heavy, and the braking torque reaction from both front wheels passes through two arms rather than being spread across a subframe and multiple links.

The chassis end bushing on each side is therefore carrying roughly half of everything the front brakes generate, concentrated into a single joint.

Factory bushings are correspondingly large, and they are still rubber because the manufacturer wanted to keep driveline and road shock out of the cabin.

That combination of high load and soft material is why these wear out on a schedule rather than lasting the life of the vehicle, and why a firmer replacement changes the feel of the front end so noticeably.

On a vehicle carrying weight, towing, or running larger tires, every one of those loads increases and the bushings see it first.

Where Nissan 240SX Radius Arm Bushings Sit and What Each Takes

Three bushing positions per side, each loaded differently.

The chassis end bushing is the big one. Every braking and acceleration load from that wheel passes through it, and it is the pivot the arm's entire arc rotates around.

The two axle end bushings take the rotational load. When the axle tries to twist under brakes or power, those two resist it as a pair, one in compression and one in tension.

That means they fail differently to each other. The chassis bushing compresses and tears from constant load with limited rotation. The axle bushings work against each other and wear at the bore.

A radius arm bushing diagram for your Nissan 240SX is worth looking at before ordering, since the three positions frequently use different part numbers and some kits cover only one end.

Radius Arm Bind on a Lifted Vehicle

This is the issue specific to the design and the reason drop brackets exist.

At standard ride height the arm sits at a shallow angle and its arc roughly matches the arc the spring and axle want to follow. Everything works within the compliance the bushings were designed to provide.

Lift the vehicle and the chassis end rises while the axle stays with the wheels. The arm now sits at a steeper angle, and the arc it swings through no longer matches what the axle is doing.

The result is what people call radius arm bind. As the suspension articulates, the arm fights the movement, and that fight is absorbed by the bushings because nothing else can give.

Symptoms are a suspension that feels harsh and limited in travel, a vehicle that lifts a wheel sooner than it should off road, and bushings that tear themselves apart in a fraction of their normal life.

Anyone replacing radius arm bushings repeatedly on a lifted vehicle is treating a geometry problem as a wear problem.

Radius Arm Drop Brackets

Drop brackets lower the chassis mounting point to restore the arm's original angle.

By moving the pivot down by roughly the amount the body went up, the arm returns to sitting at something close to its designed angle, and the arc it swings through matches the axle again.

That removes the bind rather than managing it, which is why bushing life improves dramatically afterward and why articulation comes back.

Radius arm brackets are usually supplied as a bolt-on pair, though the mounting is carrying serious load and the installation deserves care.

Caster changes when the arm angle changes, so an alignment check afterward is part of the job rather than optional.

On any lift beyond a modest height, drop brackets and bushings are worth considering together rather than fitting bushings now and brackets later.

Caster, Offset Bushings and Steering Feel

The radius arm sets where the axle housing sits rotationally, which makes it the caster adjustment point on these vehicles.

Offset bushings place the sleeve away from center, so fitting them rotates the arm's effective mounting and takes the axle with it. That recovers caster lost to a lift without replacing the arms.

Direction depends on orientation, so the listing specifies which way the offset faces and getting it wrong moves caster the wrong way.

What makes caster matter here is steering feel. Positive caster is what returns the wheel to center after a corner and what gives the steering weight on center. Lose it and the vehicle wanders, which on a solid front axle is tiring and on a heavy one is worse.

Worn bushings produce the same symptom without changing the static setting, since the axle rotates under load and springs back afterward.

What Worn Nissan 240SX Radius Arm Bushings Feel Like

The chassis end and the axle end announce themselves differently.

A worn chassis bushing shows up under braking. The axle moves fore and aft, caster changes with it, and the steering goes light exactly when you want it connected. It returns to normal once you are off the brakes.

Worn axle end bushings show up under power. The housing is free to rotate slightly, which produces the wind up and release that feels like hop or judder pulling away hard.

Both produce a clunk over bumps, and both let the vehicle wander at highway speed with no alignment fault to find.

Visible failure is usually rubber bulging past the washer or separating from its sleeve rather than splitting outright.

Replacing Nissan 240SX Radius Arm Bushings

These are large, heavily loaded bushings pressed into thick housings, so a press and the right sleeves rather than improvised tooling.

Support the axle before releasing the arms, since it moves once both ends are free and the assembly is heavy enough to do damage.

Expect to find the through bolts seized solid. They sit in the spray from the front wheels and collect water, and a bolt untouched for a decade often has to be cut.

Do all three positions on both radius arms at once. Mixing new firm bushings with worn ones leaves the axle still moving and loads the new parts unevenly.

Torque at ride height with the vehicle on its wheels so each bushing takes its set in the position it will work in, then have caster checked before the vehicle goes back on the road.

Find Radius Arm Bushings for Your Nissan 240SX

Radius arm bushings belong to our bushings lineup, with C-bushings for caster correction.

Select your Nissan 240SX to see the radius arm bushings available for it, covering chassis and axle positions, with offset versions where caster correction is needed. If the vehicle has been lifted and the bushings keep failing, look at drop brackets before buying another set.