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SKU: HA091-HA
OS Giken 1999-2004 Honda S2000 / 2004-2005 Mazda Miata (MT Only) Super Lock LSD
The OS Giken Super Lock LSD (HA091-HA) is a clutch-type limited slip differential that replaces the stock open diff in 1999-2004 Honda S2000 and 2004-2005 Mazda Miata manual transmission models. This direct-fit unit locks both acceleration and deceleration for consistent power delivery to both wheels. Drivers gain superior corner exit speed and stability in drift racing or autocross.
Key Features
- Clutch-Type Design: 6-plate clutch pack with high initial torque (70-120 Nm) engages instantly for full power transfer under load
- Forged Gears: 4340 chrome-moly steel side and pinion gears resist shock loads and wear in high-horsepower builds
- Super Lock Ramp Angles: Aggressive 50-degree accel and 45-degree decel angles provide 100 percent lock ratio for maximum grip
- 2-Way Operation: Locks on throttle on and off for drift control and rally-style traction
- Maintenance-Free: Sealed design with lifetime clutch durability under proper oil use
Product Notes
- Manual transmission only, not compatible with automatics
- Requires OS Giken LS gear oil or equivalent GL-5 75W-90 synthetic
- Ships in protective crate, handling fee may apply for heavy item
Installation Notes
- Professional installation recommended.
- Drain stock differential fluid completely before install
- Direct bolt-in replacement, uses OEM mounting hardware
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2004 | Honda | S2000 | Base |
| 2004-2005 | Mazda | Miata | Mazdaspeed |
Why Choose OS Giken?
- Proven in D1 Grand Prix drifting and Super GT racing
- Hand-assembled in Japan with tight tolerances
- Engineered for 500+ HP applications without failure
Frequently Asked Questions
-
Q: Will this fit 1999-2004 Honda S2000 with stock differential?
A: Yes, HA091-HA is a direct replacement for AP1 S2000 MT models worldwide -
Q: What materials are used in construction?
A: Forged 4340 steel gears, high-capacity steel clutch plates, and aluminum housing -
Q: What is the warranty and break-in procedure?
A: 1-year manufacturer warranty, initial 500-mile break-in with light driving and fluid change
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure wooden crate 15x15x15 inches
- Weight: 48 lbs (21.8 kg)
Differentials
Differentials distribute engine torque between drive wheels, allowing them to rotate at different speeds through corners while maintaining traction. Upgrading from a factory open differential to a limited-slip or locking differential is one of the most impactful drivetrain improvements you can make for towing, off-roading, drag racing, or any application where both wheels need to work together under load.Popular Differential UpgradesTop upgrades include Eaton Detroit Locker and Eaton Truetrac limited-slip units for GM, Ford, Dana, and Chrysler axles, ARB Air Lockers for Jeep and truck off-road applications, and OS Giken Super Lock LSD units for JDM performance platforms. Locker conversions for Dana 44 and Dana 60 front axles are essential for serious rock crawling, while Truetrac helical LSDs deliver traction improvements without aggressive locking behavior for street and tow applications.What is the difference between a locker and a limited-slip differential?A locking differential ...
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Shop OS Giken drivetrain parts, Super Lock LSD differentials, limited slip differentials, twin plate clutches, racing clutch kits, gear oil, differential covers, release sleeves, clutch alignment tools, and high-performance Japanese motorsport components at Black Ops Auto Works. OS Giken is known for precision-engineered drivetrain upgrades built in Japan for racing, track use, drifting, time attack, road racing, street performance, and high-horsepower applications. Whether you are upgrading a Nissan 350Z, 370Z, 240SX, Skyline RB26DETT, Toyota Supra, Toyota GT86, Scion FR-S, Mazda Miata, Mazda RX-7, Honda S2000, Honda Civic Type R, BMW M3, BMW M5, Porsche Cayman, Porsche Boxster, Ford 8.8 rear end, Mini Cooper S, or Datsun Z car, this OS Giken collection helps you find premium drivetrain parts designed for traction, durability, power transfer, and motorsport-level control. Shop OS Giken Parts by Category Browse OS Giken performance drivetrain upgrades across popular categories, incl...
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