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Precision Japanese Differential Engineering for Classic Nissan Long-Nose R200 Axles
The OS Giken OSGNS082-HA Super Lock LSD is a purpose-built limited-slip differential engineered specifically for the Long Nose R200 differential housing found in the Datsun 280ZX and Nissan 300ZX. Unlike general-application LSDs, the OSGNS082-HA uses OS Giken's patented pressure ring design with a spline-through-side-gear construction that delivers up to twice the friction plate count of competing units, translating to more consistent, progressive lockup under hard acceleration and during corner exit.
Key Features
- OS Giken Super Lock 1.5-way LSD with patented pressure ring design
- Spline-through-side-gear construction for superior load distribution
- Up to 2x more friction plates than competing units for stronger lockup
- CNC-machined billet differential case for maximum rigidity
- Ramp angles: 25 degrees acceleration / 38 degrees deceleration
- Lock Timing: 336 for progressive, predictable engagement
- Total friction plates: 20 for exceptional torque transfer
- Preload: 8S for consistent daily and track use
- Fits 10mm ring gear bolt holes only (Long Nose R200 specific)
- Reuses factory 10mm differential bolts, no special hardware required
- Direct bolt-in replacement, no differential case modification needed
- Made in Japan by OS Giken to strict motorsport tolerances
Fitment
| Year Range | Make | Model |
|---|---|---|
| 1979-1983 | Nissan | 280ZX (S130) L6 |
| 1990-1996 | Nissan | 300ZX Z32 VG30DE Non-Turbo |
Specifications
| Detail | Value |
|---|---|
| Part Number | OSGNS082-HA |
| Brand | OS Giken |
| LSD Type | Super Lock 1.5-way |
| Ramp Angles | 25 Accel / 38 Decel |
| Lock Timing | 336 |
| Total Friction Plates | 20 |
| Preload Setting | 8S |
| Housing Compatibility | Long Nose R200 (10mm ring gear bolts) |
| Transmission Compatibility | All factory transmissions for applicable models |
| Material | Billet differential case, hardened friction plates |
| Country of Manufacture | Japan |
| UPC | N/A |
What's Included
- 1x OS Giken OSGNS082-HA Super Lock LSD unit
- Friction plates and pressure rings pre-assembled
- Installation hardware (reuses factory 10mm ring gear bolts)
About OS Giken
OS Giken has been producing championship-winning motorsport components in Japan since 1969. Their Super Lock LSD line is engineered with the same tolerances used in top-level motorsport competition and is trusted by professional racing teams worldwide. Every OSGNS082-HA unit is manufactured in-house in Okayama, Japan and undergoes strict quality control before leaving the factory.
Frequently Asked Questions
Is the OSGNS082-HA compatible with the turbocharged 300ZX Z32?No. The OSGNS082-HA fits the 300ZX Z32 with the VG30DE non-turbo engine only. The turbocharged Z32 uses a different differential configuration and requires a separate OS Giken part number.
Does the OSGNS082-HA work with 12mm ring gear bolt R200 differentials?No. This unit is designed specifically for Long Nose R200 housings with 10mm ring gear bolt holes. If your differential uses 12mm ring gear bolts, you need the OS Giken NS091-HA instead.
Does the OS Giken OSGNS082-HA require new bolts or hardware?No. The OSGNS082-HA reuses your factory 10mm differential ring gear bolts. No special hardware is required for installation.
What does 1.5-way mean on the OS Giken Super Lock LSD?A 1.5-way LSD provides full lockup under acceleration and partial lockup under deceleration. This gives you maximum traction on corner exit while preserving manageable handling under braking, making it ideal for both track days and street driving.
What is the ramp angle on the OSGNS082-HA and why does it matter?The OSGNS082-HA uses 25-degree acceleration ramps and 38-degree deceleration ramps. Lower ramp angles create more aggressive lockup, while higher angles provide smoother, more progressive engagement. This combination is tuned for performance driving without sacrificing drivability.
How many friction plates does the OS Giken LSD have compared to other brands?The OSGNS082-HA uses 20 total friction plates, which is up to twice the count found in competing units. More friction plates distribute clamping load more evenly, extending service life and delivering more consistent lockup across a wider range of temperatures.
Can the OSGNS082-HA be rebuilt or retuned?Yes. OS Giken LSDs are fully serviceable. Friction plates and ramp components can be replaced or swapped to alter the lockup characteristics. OS Giken also offers different ramp angle kits for customers who want to tune engagement for specific driving styles.
How difficult is it to install the OS Giken OSGNS082-HA in a Nissan 280ZX or 300ZX?Installation is a direct bolt-in swap into the existing Long Nose R200 differential housing. A competent home mechanic comfortable with rear differential service can complete this job, though most customers prefer to have a shop handle setting ring and pinion backlash and bearing preload during reassembly.
What gear oil does OS Giken recommend for the OSGNS082-HA?OS Giken recommends a 75W-90 GL-4 or GL-5 differential gear oil. Avoid LSD-specific additives that claim to reduce chatter, as these can reduce friction plate clamping force and diminish performance. Break-in with standard gear oil for the first 500 miles before a fluid change.
Installation Overview
- Safely lift and support the vehicle, drain differential fluid from the rear axle housing
- Remove driveshaft, axle shafts, and rear differential cover or housing as applicable
- Remove the OEM open differential or existing LSD unit from the R200 housing
- Transfer the ring gear from the OEM carrier to the OSGNS082-HA using factory 10mm bolts, torquing to spec
- Install the OSGNS082-HA assembly into the differential housing, check ring and pinion backlash (0.10-0.15mm recommended)
- Set bearing preload per factory specification, reinstall housing cover
- Reinstall axle shafts, driveshaft, and torque all fasteners to spec
- Fill with fresh 75W-90 GL-4/GL-5 gear oil to the correct level
- Perform a short break-in drive of 10-15 miles with light to moderate acceleration before any hard driving
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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