JZX90 Suspension Parts: A Complete Guide to Upgrades and Replacements

If you own a Toyota JZX90 (Chaser, Mark II, or Cresta), you know this chassis combines luxury with performance potential. The factory suspension was designed for comfort, but after 20+ years, bushings wear, dampers fade, and handling degrades. Whether you're restoring a daily driver or building a drift car, upgrading JZX90 suspension parts transforms the driving experience. This guide covers what you need to know—from coilovers to control arms—so you can make informed choices.

Understanding the JZX90 Suspension Architecture

The JZX90 uses a front MacPherson strut setup and a rear multilink independent suspension. Both ends rely on rubber bushings that deteriorate over time. The front features lower control arms and a stabilizer bar; the rear has upper and lower control arms, toe links, and a stabilizer bar. Replacing these components with polyurethane or solid bushings reduces flex and improves steering response. Coilovers replace the factory struts and springs, offering adjustable ride height and damping.

Key JZX90 Suspension Components to Consider

Coilovers

Coilovers are the most impactful upgrade. They combine a shock absorber and spring into one unit with adjustable preload and ride height. For street use, brands like BC Racing, Tein, and HSD offer models with pillowball top mounts and damping adjustment. For track or drift, consider KW or Ohlins for higher performance. Avoid cheap no-name coils—they ride harsh and fail quickly. Budget around $800–$2,000 for a quality set.

Control Arms

Rear upper control arms (RUCA) and lower control arms (RLCA) from brands like Ikeya Formula, Hardrace, or Megan Racing allow alignment adjustment. Stock arms have limited adjustability. Upgraded arms with spherical bearings eliminate compliance and let you dial in camber and toe. For the front, tubular lower control arms reduce weight and increase steering precision.

Sway Bars

Thicker sway bars reduce body roll without ruining ride quality. Whiteline, Cusco, and Eibach make 22mm–27mm bars for the JZX90. Pair with upgraded end links to prevent binding.

Bushings

Polyurethane bushing kits from Energy Suspension or SuperPro replace every rubber bushing. Full kits cover front LCA, rear LCA, subframe, and differential mounts. Installation is labor-intensive but eliminates vagueness. For a street car, polyurethane is fine; for track duty, consider solid spherical bushings for maximum feedback.

Subframe and Solid Mounts

Rear subframe bushings sag under load, causing wheel hop. Replace them with polyurethane or aluminum collars. Solid differential mounts and rear subframe risers improve traction, especially for high-horsepower builds.

Upgrading vs. Replacing: What Makes Sense for Your JZX90?

Daily Driver: Replace worn bushings with polyurethane, refresh struts with quality dampers like KYB or Bilstein B6, and add a mild lowering spring (e.g., Swift or TRD). This maintains ride comfort while sharpening response.

Street Performance: Install a full set of coilovers (8–12kg springs), adjustable control arms, and a stiffer sway bar. This setup handles well on back roads and track days.

Drift/Aggressive Use: Go with low-stiffness coilovers (10–14kg springs), solid spherical bushings, a weldcut or hydraulic handbrake-friendly arms, and a reinforced subframe. Prioritize durability and adjustability.

Choosing the Right Parts: Practical Tips

Coilover Selection

• Spring rates: 6–8kg for street comfort, 10–12kg for performance, 14kg+ for track. Match front and rear bias.
• Damping adjustment: 16–30 clicks vs. high-speed compression adjustability. For daily use, 16-click damping is sufficient.
• Top mounts: Pillowball mounts increase noise but improve caster and camber. Stock rubber mounts isolate noise.
• Height adjustment: Full-threaded bodies allow lower ride height but may limit droop travel.

Control Arm Materials

Steel arms are strong but heavy; aluminum reduces unsprung mass for better ride and response. Chromoly offers a balance. Spherical bearings (rod ends) provide zero compliance but transmit noise and vibration. Polyurethane bushings are a good middle ground for street use.

Alignment and Geometry

After installing adjustable arms, get a proper alignment. Common specs for a JZX90: -1.5 to -2.0 degrees front camber, 0 rear camber, and 1–3mm toe-in rear. Running too much negative camber wears tires prematurely. Always tighten bolts with the suspension loaded to prevent bushing binding.

Installation Considerations

Some JZX90 suspension parts require specialized tools and knowledge. Subframe bushings often need a press or burning out rubber. Coilover installation is straightforward but requires spring compressors and torque wrenches. If you're not comfortable with DIY, budget $400–$800 for professional installation. Rusted bolts are common on older cars; use penetrating oil and heat if needed. Replace hardware with grade 10.9 bolts for safety.

Maintenance Tips for Longevity

• Check coilover preload and ride height annually.
• Grease polyurethane bushings every 10,000 miles if they have zerk fittings.
• Inspect tie rod ends and ball joints for play.
• Keep alignment within spec to avoid funky tire wear.
• After a track day, let coilovers cool before adjusting damping.

Final Recommendation

For most JZX90 owners, start with a quality set of coilovers (BC Racing or Tein) and a full polyurethane bushing kit. This combination transforms handling without breaking the bank. Add adjustable rear upper control arms later for fine-tuning alignment. Avoid tracking or drifting on stock suspension—it's unsafe and uncompetitive. Prioritize parts that solve your specific needs: comfort, grip, or adjustability. With the right JZX90 suspension parts, your Chaser, Mark II, or Cresta will handle like a new car while retaining its classic character.