Tein GSP26-8UAS2 Street Basis Z Coilovers 2003-08 Nissan 350Z Infiniti G35 RWD

Vehicle Fitment

• 2003-2008 Nissan 350Z Coupe (Z33, RWD, 3.5L VQ35DE V6)
• 2003-2008 Nissan 350Z Roadster/Convertible (Z33, RWD, 3.5L VQ35DE V6)
• 2003-2007 Infiniti G35 Coupe (V35, RWD, 3.5L VQ35DE V6)
• 2003-2006 Infiniti G35 Sedan (V35, RWD, 3.5L VQ35DE V6)

Fitment Notes

• RWD only - does NOT fit AWD G35 Sedan (G35x) or any AWD variant
• Does NOT fit the 2007+ Infiniti G35 Sedan (V36 platform) - G35 Sedan fitment ends at 2006 model year only
• Rear suspension uses a divorced shock/spring design (OEM style) - the rear damper and spring are separate units, NOT a traditional coilover assembly
• OEM upper mounts (front and rear) must be reused - upper mounts are NOT included with this kit
• Damping force is fixed (non-adjustable) - factory-calibrated by Tein for this application
• Camber adjustment is NOT possible with this kit - camber correction requires separate aftermarket camber arms
• Lowering ranges vary significantly between the 350Z Coupe, 350Z Convertible, G35 Coupe, and G35 Sedan - see Specifications for per-model drop heights

Features

• Height-adjustable coilover system - threaded lower collar and ZT-coated spring seat allow ride height to be set anywhere within the full lowering range
• Divorced rear shock/spring configuration mirrors the OEM rear suspension architecture of the Z33/V35 platform, maintaining full rear suspension stroke and geometry
• Twin-tube damper construction delivers longer stroke with lower initial repulsive force compared to mono-tube designs, providing superior ride compliance at lowered heights
• Fully sealed crimped damper structure - oil and gas injected, then sealed by metal crimping for a compact, durable, and cost-effective build
• Fixed damping factory-calibrated by Tein for the FM-platform chassis dynamics - matched spring-damper system installed and ready with no user tuning required
• Uniform 9.0 kgf/mm (504 lb/in) spring rate front and rear for a balanced spring weight distribution across the Z33/V35 FM chassis
• ZT-coated threaded sleeve resists corrosion and ensures smooth, consistent collar adjustment
• SAE9254 cold-formed springs with minimum tensile strength of 200 kgf/mm² - sag-proof and highly resilient under sustained performance loads
• Powder-coated spring finish is chip-resistant and corrosion-resistant in all conditions
• High-performance damper oil maintains stable viscosity across a wide temperature range, with excellent anti-foaming and anti-cavitation properties for sustained sport use
• Ergonomic long-handled flanged adjustment wrenches included for easier collar turns without slip
• Manufactured in Japan to Tein's strict quality control standards

Specifications

• Part Number: GSP26-8UAS2
• Product Line: Street Basis Z (SBZ)
• Part Type: Coilover Damper Kit (Full Set - Front Coilovers + Rear Divorced Shock/Spring Units)
• Vehicle Platforms: Nissan 350Z Z33 (2003-2008); Infiniti G35 V35 Coupe (2003-2007); Infiniti G35 V35 Sedan RWD (2003-2006)
• Drivetrain: RWD Only
• Engine: 3.5L VQ35DE V6
• Damper Type: Twin-Tube
• Rear Configuration: Divorced Shock/Spring (OEM Style - separate damper and spring)
• Damping Adjustment: Fixed (Non-Adjustable)
• Height Adjustment: Thread-Type (Lower Spring Seat)
• Spring Rate (Front): 9.0 kgf/mm (504 lb/in)
• Spring Rate (Rear): 9.0 kgf/mm (504 lb/in)
• Spring Material: SAE9254 Cold-Formed Steel (Min. 200 kgf/mm² Tensile Strength)
• Spring Finish: Powder Coated
• Sleeve Coating: ZT (Corrosion Resistant)
• Upper Mounts: OEM Reuse Required - NOT Included (Front and Rear)
• Lowering Range - 350Z Coupe (Z33): Front 0.0 in.-3.1 in. / Rear 0.4 in.-2.1 in.
• Lowering Range - 350Z Convertible (Z33): Front 0.2 in.-3.3 in. / Rear 0.4 in.-2.0 in.
• Lowering Range - G35 Coupe (V35 RWD): Front 0.6 in.-3.7 in. / Rear 0.7 in.-2.3 in.
• Lowering Range - G35 Sedan (V35 RWD): Front 1.4 in.-4.4 in. / Rear 1.5 in.-3.2 in.
• Quantity: 4 (Complete Set)
• Country of Manufacture: Japan
• Warranty: 1-Year Limited (through authorized Tein dealers)

Included Components

• 2x Front Coilover Assemblies (Left and Right)
• 2x Rear Shock Absorber Units (Left and Right - divorced from spring)
• 2x Rear Springs (Left and Right - separate from rear shock)
• 1x Set of Adjustment Wrenches (Ergonomic Long-Handle, Flanged)
• 1x Installation Hardware

Product Description

The Tein Street Basis Z (Part #GSP26-8UAS2) is a height-adjustable coilover kit engineered for the 2003-2008 Nissan 350Z (Z33) and 2003-2007 Infiniti G35 Coupe and 2003-2006 G35 Sedan - all RWD, VQ35DE-powered FM-platform vehicles. A critical distinction of this kit is the rear suspension configuration: rather than a traditional coilover arrangement, the rear uses a divorced shock/spring design that mirrors the OEM FM-platform architecture, with the rear damper and spring operating as separate units. This approach preserves the full rear suspension geometry and shock travel of the factory setup while still enabling adjustable ride height at the rear spring seat. Front suspension uses a conventional front strut coilover assembly with threaded collar height adjustment.

The spring rate is set at a uniform 9.0 kgf/mm (504 lb/in) front and rear - a balanced choice for the FM platform's near-50/50 weight distribution that provides meaningful stiffness for improved cornering dynamics and body motion control without sacrificing daily street compliance. The fixed damping is calibrated by Tein to work cohesively with these spring rates, delivering a setup that is ready to perform from the day of installation without any user adjustment. Lowering ranges differ significantly across sub-models: the G35 Sedan offers the widest drop potential (up to 4.4" front, 3.2" rear), while the 350Z Coupe sits at a lower stock height and has a tighter range. Owners should choose their preferred height setting carefully, as the kit accommodates a wide spectrum from barely lowered to aggressively slammed.

OEM upper mounts must be reused at both front and rear, and are not included with this kit. Because camber adjustment cannot be performed through the upper mounts, owners who set the car significantly lower than stock should plan for separate aftermarket camber arms to restore proper alignment geometry. This kit does not fit the AWD G35 Sedan (G35x) or the 2007+ G35 Sedan (V36 platform). Manufactured in Japan to Tein's strict quality standards, with SAE9254 cold-formed springs and Tein's proprietary high-performance damper oil, and backed by a 1-year limited warranty through authorized Tein dealers, the Street Basis Z GSP26-8UAS2 is a proven, cost-effective suspension upgrade for Z33 and V35 platform owners seeking a quality height-adjustable setup.