OS Giken NS201-FB21 OS-88 6-Speed Sequential Transmission Option Ratio 1 Nissan Skyline GTR

The OS Giken NS201-FB21 OS-88 Six-Speed Sequential Transmission (Option Ratio 1) is a race-engineered gearbox purpose-built for the Nissan Skyline GTR platform. Designed to maximize the performance potential of the iconic RB26DETT engine, this transmission is constructed using reinforced forged materials capable of withstanding the extreme torque output of a high-powered twin-turbocharged drivetrain.

The "88" designation refers to the optimized 88mm gear axis distance, which allowed OS Giken to significantly increase the transmission's structural strength and torque capacity. The result is a 6-speed sequential gearbox rated to handle up to 1,500 horsepower. OS Giken's proprietary dog-link engagement mechanism delivers lightning-fast, precise shift changes with a positive, mechanical shift feel preferred in motorsport applications.

Option Ratio 1 Gear Ratios:

• 1st: 2.609
• 2nd: 1.934
• 3rd: 1.521
• 4th: 1.210
• 5th: 1.000
• 6th: 0.785

Key Specifications:

• Torque Capacity: 120 kg-m
• Engagement Type: Dog (not synchro)
• Gear Type: Helical
• Gear Axis Distance: 88mm
• Max Power Handling: up to 1,500 HP

What's Included:

• Bell housing
• Transmission assembly
• Shift indicator

Every OS-88 unit is hand-built to order and individually inspected to OS Giken's exacting quality standards before shipment. This is a special-order item intended for serious motorsport and high-performance track builds. OS Giken recommends consulting the service manual for proper installation.