SKU: TY421-HA
OS Giken Toyota GT86 Scion FR-S Subaru BRZ Super Lock LSD (TY421-HA 2013-2021)
The OS Giken Super Lock LSD TY421-HA is a 2-way clutch-type limited slip differential built for Toyota GT86 Scion FR-S and Subaru BRZ models spanning 2013 to 2021. It replaces the stock open differential to distribute power evenly to both rear wheels enhancing straight-line acceleration stability and cornering traction. Track and drift drivers rely on this LSD for consistent performance under high loads.
Key Features
- 2-Way Locking: Engages full lock on acceleration and deceleration sending power to the wheel with grip
- High-Capacity Clutch Pack: 8 initial torque plates plus 8 reaction plates deliver consistent torque bias and resist wear
- Shot-Peened Gears: SCM415 alloy steel gears with carburizing treatment handle extreme torque while minimizing noise
- Reinforced Case: High-tensile ductile iron housing withstands racing stresses without flexing
- Direct Bolt-In Design: Matches OEM dimensions and spline count for seamless swap with stock 4.1 final drive
Product Notes
- Use OS Giken LSD gear oil or equivalent 75W-90 GL-5 synthetic for clutch pack longevity
- Perform 500km break-in with varied throttle and speeds avoiding full lock
- Heavy precision component handle with care during unpacking
Installation Notes
- Professional installation recommended.
- Drain OEM fluid remove stock differential and transfer internals to LSD carrier
- Compatible with OEM axles mounting bolts and 4.10 ring gear
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2013-2016 | Scion | FR-S | Base |
| 2013-2017 | Subaru | BRZ | Limited |
| 2013-2017 | Subaru | BRZ | Premium |
| 2013-2020 | Subaru | BRZ | tS |
| 2015 | Subaru | BRZ | Series.Blue |
| 2016 | Subaru | BRZ | Series.Hyperblue |
| 2017-2021 | Toyota | 86 | Base |
| 2017 | Toyota | 86 | Special Edition |
| 2017-2020 | Toyota | 86 | GT |
| 2018-2020 | Toyota | 86 | Hakone Edition |
Why Choose OS Giken?
- Japanese specialist in clutch LSDs with decades of drifting competition wins
- Hand-built units ensure every LSD meets racing standards
- Engineered for ZN6 platform with exact tolerances for reliability
Frequently Asked Questions
- Q: Does TY421-HA fit 2018-2021 Toyota 86 and Subaru BRZ?
A: Yes direct fit for all ZN6 chassis 86 FR-S BRZ models 2013-2021 regardless of submodel or transmission - Q: What materials are used in construction?
A: Ductile iron case SCM415 gears and high-friction clutch plates built for high horsepower abuse - Q: What warranty coverage applies?
A: 12 months from purchase date covers manufacturing defects with proof of proper installation and oil
Shipping & Handling
- Method: UPS Ground / FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Original OS Giken carton 16 x 14 x 14 inches
- Weight: 44 lbs
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