Toggle Nav
My Cart

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:

  OEM OS Giken
1st Gear 3.214 2.695
2nd Gear 1.925 1.703
3rd Gear 1.302 1.236
4th Gear 1.000 1.00
5th Gear 0.752 0.826


Full installation available in-house at Garage-D. Call or email for more details.


More Information
Commodity Code HS84834051
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account