SKU: FD881-HA
OS Giken Super Lock LSD for Ford 8.8″ 31-Spline (25/35-336-10-10s 4-D)
Experience the ultimate in traction and control with the OS Giken Super Lock LSD. After more than four years of research and development, OS Giken created a revolutionary limited-slip differential capable of housing up to 28 friction plates nearly twice as many as most competitors.
his allows the Super Lock LSD to achieve true 100% lock in a progressive, smooth, and ultra-quiet manner, making it ideal for both street driving and serious racing applications. The patented lock timing system, combined with a miniaturized pressure ring and spline-through-side-gear design, delivers exceptional performance while maintaining excellent everyday drivability.
Whether you’re carving canyons, launching at the drag strip, or navigating wet roads, the OS Giken Super Lock LSD provides superior traction without the harshness or noise associated with traditional clutch-type LSDs.
Key Features
- Up to 28 Friction Plates – Nearly 2x the capacity of most competitors for true 100% lock
- Progressive & Smooth Locking – Patented lock timing system for quiet, predictable engagement
- Miniaturized Pressure Ring – Allows more friction plates while maintaining compact fitment
- High-Grade Materials – Chemically heat-treated components and raw-forged gears for maximum durability
- Billet LSD Case – Machined from a single piece for superior strength and uniformity
- Low Preload with Full Lock – Feels like an open diff during normal driving but locks 100% under load
- No Break-In or Rebuild Required – Precision manufacturing eliminates the need for initial break-in
- Fully Tunable – Adjustable initial torque, lock progression, and ramp angles
Specifications
| Detail | Value |
|---|---|
| Brand | OS Giken |
| Type | Super Lock Limited Slip Differential (LSD) |
| Application | Ford 8.8″ Rear End – 31 Spline |
| Friction Plates | Up to 28 (2x more than most competitors) |
| Lock Type | Progressive Clutch-Type with Patented Timing |
| Country of Origin | Japan |
| Warranty | OS Giken Limited Warranty |
Whats Included
- OS Giken Super Lock LSD Assembly
- Pressure Rings & Clutch Discs
- Cone Springs
- Installation Hardware
- Installation Instructions
Product Notes
- Professional installation by an experienced differential technician is strongly recommended
- Compatible with Ford 8.8″ rear ends using 31-spline axles
- Available in standard and Spec-X configurations (contact us for custom Spec-X orders)
- TCD (Traction Control Differential) version available for even smoother operation
This Part Fits
| Application | Notes |
|---|---|
| Ford Mustang (8.8″ Rear) | Most 2011–2024 models with 31-spline axles |
| Ford F-150 (8.8″ Rear) | Select years and configurations |
| Ford Explorer / Sport Trac | 8.8″ rear axle applications |
| Custom Ford Builds | Any vehicle using Ford 8.8″ 31-spline rear end |
Why Choose OS Giken?
- Japanese performance leader in high-end drivetrain components since 1983
- Revolutionary Super Lock design with industry-leading plate count
- Precision engineering trusted by professional race teams worldwide
- Progressive locking that feels smooth on the street and aggressive on the track
Frequently Asked Questions
- Q: How many friction plates does this LSD have?
- A: Up to 28 friction plates — nearly twice as many as most competing LSDs.
- Q: Is this LSD noisy?
- A: No. The Super Lock LSD is engineered for ultra-quiet operation with progressive, smooth locking.
- Q: Will this fit my 2018 Mustang GT?
- A: Yes, as long as your Mustang has the 8.8″ rear end with 31-spline axles (most 2011–2024 Mustangs do).
- Q: Can I adjust the locking behavior?
- A: Yes. Initial torque, lock progression timing, and ramp angles are all tunable.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure oversized OS Giken packaging
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