OS Giken TCD Super Lock 2-Way Rear LSD for 2009-2025 R35 GT-R - NS251-HC

TCD-spec Super Lock rear differential

35/35 ramp configuration for 2-way operation

28 TCD friction plates

Low-preload standard specification

Smooth, progressive 100% locking capability

TCD plates support improved oil cooling

Chemically heat-treated steel components

Single-piece billet-machined differential case

Manufacturer Part Number: NS251-HC

Series: Super Lock

Configuration: TCD specification

Position: Rear

Differential Type: 2-way limited-slip differential

Ramp Angles: 35/35

Lock Timing: 448

Total TCD Plates: 28

Preload: 12S

Maximum Lock Capability: 100%

Material: High-grade steel alloy

Gear Construction: Raw forged

Differential Case: Machined from a single billet

Installation Reference: OEM service manual

OS Giken is a Japanese performance-parts manufacturer specializing in high-performance drivetrain and engine components. Officially founded in 1973, the company is headquartered in Okayama, Japan, where its products are manufactured and assembled under strict quality-control standards. OS Giken is best known for its multi-plate clutch systems, Super Lock limited-slip differentials, close-ratio gearsets and competition transmissions. Its engineering philosophy focuses on improving power transfer, durability and drivability through original mechanical designs rather than simply modifying factory-style components.

For Nissan Skyline GT-R and Nissan GT-R applications, OS Giken offers drivetrain upgrades for the R32, R33, R34 and R35 platforms. Available products include twin-, triple- and quad-plate clutch kits, front and rear Super Lock LSDs, clutch service components and the OS-88 six-speed sequential transmission for RB26-powered Skyline GT-Rs. The OS-88 is designed around the RB26DETT and is rated by OS Giken for applications producing up to 1,500 horsepower. For the R35 GT-R, OS Giken offers a Super Lock rear differential designed to provide smooth, progressive engagement and strong lock under power. Whether preparing a street-driven Skyline or a dedicated competition build, OS Giken provides precision drivetrain components developed for demanding power levels and performance use.

OS Giken does not publish one fixed warranty period covering every product. Warranty duration and coverage vary by product line, and all claims are subject to inspection and approval by OS Giken or the applicable manufacturer. Approved claims may result in repair or replacement of the affected product.

Warranty coverage does not apply when damage is caused by:

• Abuse, negligence or mishandling
  
• Incorrect application or unverified fitment
  
• Improper installation or product modification
  
• Damage unrelated to a manufacturing defect
  

To begin a claim, contact Elite GT-R Parts with:

• Your order number and OS Giken part number
  
• A detailed description of the issue
  
• Clear photographs or video of the product
  
• Vehicle, installation and operating information

Do not disassemble, modify or return the product before receiving instructions. Keep the product, packaging and all related installation documentation, as inspection may be required. Final warranty eligibility, coverage period and resolution are determined by OS Giken under the terms applicable to the specific product.