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Stop Wandering Steering on Your First Generation LS400
A quarter century of miles takes a toll on the factory rubber bushings in the LS400's front upper control arms, and the result is vague steering feel and accelerated tire wear from constantly shifting alignment. The SuperPro SPRSPF1352K replaces those tired rubber bushings with polyurethane at the front upper inner mounting location, locking in consistent geometry mile after mile.
Key Features
- Direct replacement for the front upper inner control arm bushing on the LS400
- Polyurethane construction resists the compression set that causes rubber bushings to fail
- SPRSPF1352K restores accurate wheel alignment for consistent tire wear
- Reduces suspension deflection under braking and cornering loads
- Improves steering precision compared to worn factory rubber
- Bolts into the factory control arm mounting location with no modification
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1990-1994 | Lexus | LS400 |
Specifications
| Detail | Value |
|---|---|
| MPN | SPRSPF1352K |
| Brand | SuperPro |
| Position | Front upper inner |
| Material | Polyurethane |
| Warranty | Lifetime warranty on SuperPro polyurethane bushings |
| UPC | Not published by manufacturer |
What's Included
- Front upper inner control arm bushing set
- Installation hardware
About SuperPro
SuperPro has engineered performance suspension components since the 1970s, offering polyurethane replacements that outlast factory rubber bushings on classic and modern platforms alike, including aging luxury sedans like the first generation LS400.
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FAQ
What is the SPRSPF1352K?The SPRSPF1352K is a SuperPro polyurethane bushing kit that replaces the worn front upper inner control arm bushing on the 1990-1994 Lexus LS400.
How do I know if my LS400 control arm bushings are worn?Common signs include vague or wandering steering, uneven front tire wear, and a clunking noise from the front suspension over bumps.
Does polyurethane ride harsher than the factory rubber bushing?Polyurethane is firmer than factory rubber, which slightly increases feedback through the chassis but delivers noticeably more precise and consistent handling.
Will this bushing kit fix a wandering steering feel on my LS400?If the wander is caused by worn front upper control arm bushings, replacing them with this kit restores the correct geometry and typically resolves the issue.
Do I need an alignment after installing this bushing kit?Yes, an alignment is recommended after any front suspension bushing replacement to ensure camber and caster are set correctly.
Is this bushing kit a direct bolt in replacement?Yes, the SPRSPF1352K is designed as a direct replacement for the factory bushing at this location with no cutting or drilling required.
Is this kit covered under warranty?Yes, SuperPro backs its polyurethane bushings with a lifetime warranty to the original purchaser.
Can this be installed with basic hand tools?Most installers use a hydraulic press to remove and install the bushings, so a shop visit or access to a press is recommended for this job.
Install Instructions
- Raise and safely support the front of the vehicle on jack stands
- Remove the front upper control arm from the vehicle following factory service procedures
- Press out the worn factory bushing from the control arm using a hydraulic press
- Press in the new SuperPro SPRSPF1352K polyurethane bushing
- Reinstall the control arm and torque all fasteners to factory specification
- Lower the vehicle and have the front end aligned
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