Whiteline Rear Diff Bushings – 2005-2007 Subaru WRX / STI / 2005-2006 Saab 9-2X

Whiteline Rear Diff Bushings – 2005-2007 Subaru WRX / STI / 2005-2006 Saab 9-2X Aero

Firm Up the Rear Diff Mounts on Your GD WRX or STI
The rear differential mount bushings on the 2005-2007 Subaru WRX and STI allow the differential to move under hard acceleration and cornering. This movement creates drivetrain vagueness, clunking under load transitions, and inconsistent rear grip. Whiteline’s polyurethane replacement bushings reduce differential movement, improving power delivery precision and rear axle stability.

DETAILS

• Polyurethane rear differential mount bushings
• Reduces differential movement under acceleration and cornering loads
• Eliminates differential clunk and drivetrain vagueness
• Fitment: 2005-2007 Subaru WRX, STI, and Saab 9-2X Aero
• Direct press-fit replacement

GD WRX/STI Rear Differential Mounting
The rear differential on 2005-2007 GD WRX and STI models uses rubber mount bushings at the front and rear of the differential housing. These mounts are the primary interface between the differential and the chassis — when they wear or soften, the differential gains movement under load that shows up as imprecision in power delivery and rear axle feel.

Power Delivery and Differential Position
When the differential moves under acceleration, the driveshaft angles change momentarily and the rear suspension pickup points shift. This combination creates drivetrain vibration and imprecise throttle response — the car doesn’t respond cleanly to throttle inputs because the differential is moving before the wheels feel the power. Firm mounts eliminate this effect.

Saab 9-2X Coverage
The Saab 9-2X Aero is mechanically identical to the GD WRX — it shares the same drivetrain and rear differential mounting. Whiteline’s bushing covers the 9-2X Aero without modification.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

A direct fix for rear differential movement and associated drivetrain feel issues on the GD WRX, STI, and 9-2X Aero. Improve power delivery feel and rear axle precision with this targeted bushing replacement. Budget an afternoon for the job — bushing replacement is not complicated but does require the correct press tools and clean installation technique. Apply grease to all polyurethane-to-metal interfaces and assemble at ride height for correct bushing set. The improvement in chassis feel is immediate and the polyurethane will outlast whatever rubber is in there now.

What’s in the Box

• Polyurethane rear differential mount bushings
• Reduces differential movement under acceleration and cornering loads
• Eliminates differential clunk and drivetrain vagueness
• Direct press-fit replacement

Fitment