SuperPro SPF4094K Front Inner Radius-Arm Bush Kit for 1998-00 Lexus GS300/GS400

Vehicle Fitment

• 1998-2000 Lexus GS300 (3.0L I6) RWD
• 1998-2000 Lexus GS400 (4.0L V8) RWD

Features

• Premium polyurethane bushings replace original rubber radius-arm mounts for enhanced durability and control
• Specifically engineered for the front axle - inner radius arm mounting point, critical for steering geometry and longitudinal stability
• Includes steel insertion tubes for accurate fitment and optimal load distribution under dynamic conditions
• Resistant to oil, water, coolant and extreme temperatures - designed for both performance and long service life
• Improves front suspension stability, reduces movement under throttle or cornering, and helps maintain correct wheel alignment
• Covered by SuperPro's lifetime warranty against manufacturing defects
• Installation typically takes ~3 hours; full front wheel alignment recommended after fitment

Specifications

• Bushing material: SuperPro proprietary polyurethane formula
• Fitting position: Front axle - radius arm inner mount bush kit
• Kit includes: 4x polyurethane bushings + 2x steel insertion tubes (verify exact quantity per retailer)
• Installation difficulty: Moderate to high - removal of control arm required; alignment mandatory

Included Components

• 4x polyurethane bushings
• 2x steel insertion tubes

Product Description

The SuperPro SPF4094K Front Inner Radius-Arm Bush Kit is a precision upgrade or replacement solution tailored for the Lexus GS300 and GS400 (model years 1998 through 2000). Over time, the factory rubber radius arm bushings can wear, soften or allow excess movement - which negatively affects steering response, alignment retention and tyre wear. This kit uses high-grade polyurethane bushings and steel insertion tubes to restore mount stiffness, improve geometry control and extend service life under daily or performance use.

Installation involves removing the front radius arm, pressing out the worn rubber bushes and replacing them with the new SuperPro polyurethane components and tubes. Because this mount directly impacts front suspension geometry and steering feel, a full front wheel alignment is strongly recommended after installation. Fitment is confirmed for Lexus GS300 and GS400 for years 1998-2000; compatibility for other trims, engine sizes or production years outside this range should be verified before purchase.