OS Giken RB25 / RB26 Close Ratio Gear Kit
Please contact for current stock and lead times.
OS Giken Close Ratio Gear Kits are developed for those seeking improved drive train reliability and faster lap times. Gear ratios are carefully calculated for each vehicle application for the sole intention to maximize your engine's potential. Each OS gear component has been carefully designed and created using high-quality forged materials resulting in extra strength and durability.
To work with RB25/RB26 FS5R30A gearboxes.
Input shaft is available as Nissan or Hollinger spline. Please specify which is required when ordering. If not, Nissan spline will be supplied.
Vehicles before 09/1997 will need additional parts. Vehicles 10/1997 onwards you should be able to install close ratio gear kit with genuine parts replacement, however we always recommend inspection first.
OEM vs OS Giken gear ratios:
Full installation available in-house at Garage-D. Call or email for more details.