Upgrade Your Subaru with JXB Performance Driveshaft Carrier

by Dan May 3, 2026

The JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade is one of the most effective reliability and performance upgrades available for owners of Subaru Impreza, WRX, WRX STi, Outback Sport, Legacy, and Saab 9-2X models. Whether you drive your car daily, take it to the track, or simply want to eliminate drivetrain slop and vibration, this upgraded carrier solves a well‑known weakness in Subaru drivetrains. In this article, we break down what the part does, why it matters, and how upgrading can dramatically improve long‑term drivability.

What Is a Driveshaft Centre Support Bearing Carrier?

The driveshaft centre support bearing carrier is a critical component in Subaru’s two‑piece driveshaft design. Its job is to hold the driveshaft securely in position and keep the centre support bearing aligned. In many models—including 1st and 2nd generation Impreza, WRX, WRX STi, and the Saab 9‑2X—the factory carrier uses a thin rubber bushing to isolate vibration. While this reduces cabin noise, it allows significant unwanted movement.

Over time, the OEM rubber sags, cracks, or completely fails. When that happens, the driveshaft can shift off‑centre under load, causing vibration, clunking, premature wear, and a loose, imprecise feel during shifts and acceleration.

This is exactly the problem the JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade is designed to fix permanently.

The Problem With the Stock Carrier

Subaru enthusiasts have long known that the OEM carrier is a weak point. The rubber is so soft that as little as 20 lbs of force can move the driveshaft from centre to its limit. This may eliminate NVH (noise, vibration, and harshness), but it can also negatively affect drivetrain alignment and responsiveness.

Common issues caused by a failing stock carrier include:

Noticeable driveline slop during shifts or throttle application
Vibration or humming at speed
Clunking noises from underneath the vehicle
Premature centre support bearing wear
Driveshaft misalignment and sagging

On many well‑maintained cars, the OEM rubber starts cracking within 5–10 years, and in older models it often completely deteriorates. Because the original carrier is molded onto the bearing, replacing just the rubber isn’t easy without special tools.

The Solution: A Strong, Durable, Precision‑Engineered Upgrade

The JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade eliminates all the weaknesses of the stock part. Made from solid materials and engineered to clamp securely around the OEM bearing, it provides long‑term stability and precise alignment that the factory design simply can’t match.

Key benefits include:

Strong, rigid construction that will never wear out
Thicker, purpose‑built isolator bushings that prevent driveshaft movement
Maintained driveshaft alignment under all driving conditions
Significant reduction in driveline slop
Improved throttle response and shift feel
Reduced long‑term wear on the support bearing

This upgrade keeps the driveshaft centered at all times, even during rapid loading and unloading—something the OEM unit cannot do.

Street and Track Bushing Options

One of the standout features of the JXB Performance SUB03A0 kit is the availability of two bushing options. Both are far more durable and stable than the stock rubber, but each suits a different driving style.

Street Bushings: Designed to minimize NVH while offering major performance improvements. Light humming may be audible at certain speeds, but most drivers won’t notice it—especially with a modified exhaust.
Track Bushings: Built for maximum rigidity and zero‑compromise drivetrain performance. These may increase cabin noise but offer unbeatable stability for motorsports or aggressive driving.

Best of all, the bushings are interchangeable. Drivers can switch between street and track setups without replacing the entire carrier—ideal for anyone who wants flexibility.

Compatible Subaru and Saab Models

The JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade fits a wide range of Subaru vehicles, including:

1st‑gen Impreza (GM/GC/GF, 1993–1999)
2nd‑gen Impreza (GD/GG, 2000–2007)
WRX and WRX STi models through 2007
Impreza Outback and Outback Sport variants
1st‑gen Subaru Legacy (1989–1994)
Saab 9‑2X

This broad compatibility makes it one of the most versatile drivetrain upgrades available for Subaru owners.

Why This Upgrade Matters for Real‑World Driving

For everyday drivers, this upgrade helps maintain smooth, reliable operation by preventing driveshaft sag and misalignment—common issues in aging Subarus. It also eliminates the annoying vibration and clunking that often signal a failing centre support bearing carrier.

For performance‑minded drivers, the difference is even more dramatic. A stable, centered driveshaft improves shifts, sharpens throttle response, and provides a more connected driving experience. Subaru drivetrains are known for their durability, but this upgrade helps eliminate one of the system’s few weaknesses.

For track enthusiasts or spirited mountain‑road drivers, the track bushing option keeps the driveline tight and responsive under high load, hard acceleration, and rapid transitions.

Simple Installation With No Driveshaft Removal

Another major advantage of the JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade is its easy installation process. Thanks to its two‑piece clamping design, the driveshaft does not need to be removed.

Basic installation steps include:

Remove braces, splash shields, or heat shielding for access
Lower or remove the exhaust if needed
Cut off the OEM carrier and clean remaining rubber to expose the base layer
Clamp the new carrier around the existing bearing

This makes the upgrade accessible for DIY enthusiasts as well as professional workshops.

A Long‑Term Fix for a Common Subaru Issue

Whether you’re restoring an older Impreza, upgrading your WRX STi for performance, or simply eliminating driveline noise, the JXB Performance SUB03A0 Subaru Saab Driveshaft Centre Support Bearing Carrier Upgrade provides a reliable, permanent solution. With stronger materials, precision engineering, and customizable bushings, it outperforms the fragile OEM design in every way.

If you want better alignment, reduced vibration, and a more responsive drivetrain, this upgrade is one of the most worthwhile improvements you can make to your Subaru or Saab 9‑2X.