Guide to SPL Suspension Parts for the 240SX

If you own a Nissan 240SX (S13, S14, or S15), you know that upgrading the suspension is one of the best ways to improve handling and driving feel. SPL Parts is a well-known brand in the Nissan community, offering high-quality suspension components designed for street and track use. This guide covers the most popular SPL suspension parts for the 240SX, what they do, and how to choose the right ones for your build.

Why Choose SPL Parts for Your 240SX?

SPL Parts specializes in Nissan and Infiniti platforms, with a focus on precision engineering and durability. Their components are often made from 6061 aluminum or chromoly steel, with spherical bearings or polyurethane bushings. Unlike cheap eBay parts, SPL offers reliability and performance that can handle aggressive driving, drifting, or road racing. Many 240SX owners trust SPL for replacement or upgrade parts that outlast OEM.

Key SPL Suspension Parts for the 240SX

1. SPL Front Upper Control Arms

SPL front upper control arms (UCAs) are a common first upgrade. They replace the stock stamped steel arms with a lightweight, adjustable design. The main benefits:

• Adjustable camber and caster. After lowering your 240SX, you often lose negative camber. SPL UCAs let you dial in the correct alignment for better cornering and tire wear.
• Spherical bearings. The OEM rubber bushings wear out and cause sloppy handling. SPL uses high-quality spherical bearings that reduce deflection and improve steering response.
• Durability. Made from chromoly or 6061 aluminum, they resist bending under hard use.

Installation tip: These are direct bolt-on for most S13 and S14 models. You may need to trim the inner fender slightly for clearance if you have very low ride height.

2. SPL Rear Upper Control Arms

The rear upper control arms (RUCA) are equally important. The 240SX rear suspension uses a multi-link setup, and the upper link controls camber. SPL offers both stock-length and adjustable versions:

• Stock-length RUCAs: Replace worn bushings with spherical bearings. They restore factory alignment settings.
• Adjustable RUCAs: Allow you to change rear camber. Essential if you have coilovers or aftermarket subframe bushings that alter geometry.

Bushing choice: SPL RUCA come with either spherical bearings or polyurethane. Spherical bearings provide the most precise feel but transmit more noise. Polyurethane is quieter and more street-friendly.

3. SPL Toe Rods and Traction Rods

Rear toe and traction rods are critical for stability. SPL offers solid aluminum or chromoly options with heim joints.

• SPL Toe Rods: Control rear toe angle. Worn toe rods cause rear-end wander and uneven tire wear. SPL toe rods eliminate flex, keeping the rear aligned during cornering.
• SPL Traction Rods: The lower link that controls forward/backward movement of the hub. Upgrading prevents wheel hop during hard acceleration or drifting.

Pro tip: Pair these with SPL subframe bushings for maximum rigidity. The stock subframe bushings are rubber and allow excessive movement. SPL offers solid aluminum or polyurethane subframe bushings that tighten the rear.

4. SPL Tension Rods (Front Lower Control Arms)

Front tension rods connect the lower control arm to the chassis. They control caster and the forward/back position of the front wheels. SPL tension rods are a common upgrade because:

• Adjustable caster. More caster improves straight-line stability and steering return. SPL tension rods allow up to 3-4 degrees of adjustment.
• Spherical bearings. Eliminate the rubber bushing that wears out and causes clunking noises.
• Lightweight. Aluminum construction reduces unsprung weight.

Fitment note: On the S13, you may need to modify the chassis bracket if using very aggressive settings. Most bolt on without issue.

5. SPL Steering Components

SPL also makes steering rack bushings, tie rods, and spacers:

• SPL Steering Rack Bushings: Replace the stock rubber with aluminum or polyurethane. These reduce steering slop and improve feel. Simple to install.
• SPL Inner and Outer Tie Rods: For the 240SX, the outer tie rods are a common wear item. SPL offers heavy-duty versions with spherical ends. They are stronger than OEM and reduce bump steer.
• SPL Tie Rod Spacers: Used to correct bump steer when the car is lowered. They raise the outer tie rod end to re-align the steering geometry.

How to Choose SPL Suspension Parts for Your 240SX

Consider Your Intended Use

• Daily driver: Opt for polyurethane bushings or stock-length arms. They are quieter and require less maintenance.
• Track car or drift car: Spherical bearings and adjustable arms give you more control. You will need to grease the heim joints occasionally.

Budget

SPL parts are more expensive than budget brands, but they last. A full set of front and rear arms can cost $1000-$2000. Prioritize worn components: if your upper control arms are clunking, replace those first.

Compatibility

Most SPL parts fit S13 (1989-1994), S14 (1995-1998), and some fit S15 (1999-2002). Always check the product page for fitment notes. Some parts require additional modifications like trimming or adding washers.

Installation and Maintenance Tips

• Professional alignment required. After installing adjustable arms, get a proper alignment. SPL products allow a wide range of adjustment, but incorrect settings can cause unpredictable handling.
• Grease spherical bearings periodically. They come with grease fittings; use a quality marine grease to extend life.
• Check torque regularly. Heim joints can loosen over time. Use thread locker on critical fasteners.

Final Recommendation

For a balanced street and occasional track 240SX, start with SPL front upper control arms and rear toe rods. These address the most common suspension weaknesses. Add tension rods if you want better turn-in response. If you are building a dedicated drift car, go for the full set including traction rods and subframe bushings. SPL Parts are a proven investment that will improve handling and durability for years. Avoid cheap alternatives that fail under stress. Stick with SPL for peace of mind.