2003 Infiniti G35 Parts List: Suspension Components and Upgrades

The 2003 Infiniti G35 is a performance-oriented sedan that still turns heads. Its suspension system, however, is now two decades old. Bushings dry out, shocks lose damping, and springs sag. Whether you're restoring a stock G35 or upgrading for better handling, knowing the exact suspension parts is crucial. This article covers every component in the 2003 G35 suspension system—OEM replacements and common aftermarket options—so you can make informed decisions.

Front Suspension Components

The front suspension uses a double-wishbone setup with coil-over struts. Here are the key parts.

Struts and Shocks

• OEM Part Numbers: 56100-AC000 (left), 56101-AC000 (right). These are complete strut assemblies including the spring seat and mount.
• Aftermarket Options: KYB Excel-G, Monroe OESpectrum, or performance units like Koni Sport and Bilstein B6. For coilovers, consider BC Racing, Tein, or KW.
• Replacement Tip: Always replace struts in pairs (both front or both rear). The spring and strut are sold separately if you reuse old springs.

Coil Springs

• OEM Part: 54010-AC000 for front, 55010-AC000 for rear.
• Aftermarket: Eibach Pro-Kit (lowers ~1.0"), H&R Sport (lowers ~1.3"), or Swift springs for a progressive rate.
• Note: If you lower the car, you'll likely need camber correction kits to keep alignment within spec.

Control Arms

• Upper Control Arm (Front): OEM 54500-AC000. Both sides. These have ball joints that wear out.
• Lower Control Arm (Front): OEM 54510-AC000. Includes a press-in ball joint and two bushings.
• Aftermarket: Moog, Mevotech, and AC Delco offer direct replacements. For performance, SPC adjustable upper arms allow camber adjustment.

Ball Joints

• Upper Ball Joint: Pressed into the upper arm; replace the whole arm unless you have a press.
• Lower Ball Joint: Pressed into the lower arm; same advice.
• Aftermarket: Moog K500158 for lower, but again, consider complete arms if bushings are also worn.

Sway Bars and Links

• Front Sway Bar: OEM 54610-AC000, 26mm diameter.
• End Links: OEM 54618-AC000. These are a common wear item.
• Aftermarket: Hotchkis or Eibach sway bars (hollow, ~28-29mm) reduce body roll. Upgrade links like Whiteline or Energy Suspension polyurethane.

Rear Suspension Components

The rear uses a multi-link design. Parts include:

Shocks and Springs

• Rear Shocks: OEM 56210-AC000. Remove the trunk liner to access the top mount.
• Rear Springs: OEM 55020-AC000. Often replaced with aftermarket for lowering.
• Aftermarket: Same brands as front. Coilover kits usually replace all four corners.

Control Arms (Rear)

• Two Upper Links: OEM 55100-AC000 (front upper) and 55101-AC000 (rear upper).
• Two Lower Links: OEM 54321-AC000 (front lower) and 54322-AC000 (rear lower).
• Toe Links: OEM 55400-AC000. These adjust rear toe.
• Aftermarket: SPC adjustable arms for camber and toe correction. Moog non-adjustable replacements are also available.

Trailing Arms

• OEM Part: 55110-AC000. Connects the hub to the chassis.
• Aftermarket: Heavy-duty units from Megan Racing or GKTech.

Knuckles and Hubs

• Rear Knuckle: OEM 43210-AC000. Not a suspension part per se, but it houses bearings and is often needed for camber kit installation.
• Wheel Hubs: OEM 40202-AC000. Replace if you have bearing noise.

Bushings and Mounts

Bushings degrade over time, causing sloppy handling. Key bushings:

• Front Lower Control Arm Bushing: Two per arm; front and rear. OEM 54506-AC000 (front) and 54507-AC000 (rear).
• Front Upper Control Arm Bushing: One per arm; replace with arm.
• Rear Control Arm Bushings: Each link has bushings; OEM replacements are sold with the arm.
• Sway Bar Bushings: OEM 54620-AC000 (front), 54621-AC000 (rear). Upgrade to polyurethane.
• Strut Mounts: OEM 54320-AC000 (front), 54330-AC000 (rear). Replace with struts.

Steering Components

The G35 uses a rack-and-pinion system.

• Tie Rod Ends (Inner): OEM 48223-AC000.
• Tie Rod Ends (Outer): OEM 48213-AC000.
• Rack Bellows Boots: Inspect for tears.
• Aftermarket: Moog for both inner and outer; OEM is fine.

Alignment and Adjustment

After replacing suspension parts, a professional alignment is mandatory. Camber, caster, and toe must be set to spec. For lowered cars, adjustable arms allow proper alignment where stock arms cannot compensate. SPC and Kinetix offer front and rear camber kits.

Practical Recommendations

• For Daily Driving: Replace worn struts and springs with OEM equivalents (KYB or Monroe). Replace all degraded bushings with polyurethane for longevity. Stick to factory ride height unless you want stiffer ride.
• For Performance: Upgrade to coilovers (BC Racing BR series or Tein Flex Z). Add adjustable control arms for alignment correction. Upgrade sway bars for flatter cornering.
• Budget Build: Focus on struts (KYB), springs (Eibach Pro-Kit), and sway bar bushings. Replace only worn control arms instead of full sets.
• Mileage Checkpoints: At 100k miles, expect shocks to be weak and bushings cracked. At 150k, spring sag may be noticeable. Rebuild the entire suspension if you're keeping the car long-term.

Final Thoughts

The 2003 G35 suspension is well-designed but ages like any car. Having this parts list helps you order the right components whether you're replacing one part or overhauling the whole system. Cross-reference OEM numbers with aftermarket catalogs to ensure fitment. A refreshed suspension transforms the driving experience—tight, responsive, and safe. Prioritize safety-critical parts like ball joints and tie rods first, then address comfort and handling upgrades.