OS GIKEN Close Ratio Gear Set For Nissan Skyline R32 R33 RB25DET RB26DETT

OS Giken Close Ratio Gear Kits are meticulously engineered to enhance both the reliability of your drive train. With a keen focus on optimizing your engine's potential, OS Giken gear ratios are precisely calculated for each specific vehicle application. The result is a noticeable improvement in performance.

Every OS gear component is meticulously designed and forged using high-quality materials to ensure exceptional strength and durability. Our commitment to quality means you can rely on our gear kits to withstand the demands of high-performance driving.

Specifically designed to work seamlessly with RB25/RB26 FS5R30A gearboxes, their gear kits offer compatibility and exceptional performance for your Nissan vehicle.

For vehicles manufactured before September 1997, additional parts may be necessary for the installation of our close ratio gear kit.

For vehicles manufactured from October 1997 onwards, the installation can typically be accomplished by replacing genuine parts, although we always recommend a thorough inspection beforehand.

Applications:

RB25/RB26 Engines

Please Note:

Two different types of Input Shaft Spline exist, Nissan / Hollinger, Please select the correct spline using the selection method above.

Q:What is the OS Giken RB25/RB26 Close Ratio Gear Kit?

A:The OS Giken RB25/RB26 Close Ratio Gear Kit is a performance upgrade for RB25 and RB26 engines, specifically designed to improve drive train reliability and enhance lap times. It consists of carefully calculated gear ratios and high-quality forged gear components.

Q:What are the benefits of installing the OS Giken Close Ratio Gear Kit?

By installing the OS Giken Close Ratio Gear Kit, you can expect improved performance, increased power transfer efficiency, faster acceleration, and more precise gear shifts. The close ratio design allows you to maximize your engine's potential and achieve faster lap times on the track.

Q: Is the OS Giken Gear Kit compatible with RB25/RB26 FS5R30A gearboxes?

Yes, the OS Giken Gear Kit is specifically designed to work seamlessly with RB25/RB26 FS5R30A gearboxes. It offers excellent compatibility and performance for these gearbox applications.

Q: Does the gear kit come with the input shaft?

Yes, the gear kit can include the input shaft. It is available with either Nissan or Hollinger spline. When placing an order, you need to specify which spline type is required. 

Q: Are there any additional parts required for installation?

For vehicles manufactured before September 1997, additional parts may be necessary for the installation of the close ratio gear kit. However, for vehicles manufactured from October 1997 onwards, the kit can usually be installed with genuine parts replacement. We recommend performing a thorough inspection before installation to ensure compatibility.

Q: How does the OS Giken gear ratio compare to the OEM ratio?

Here is a comparison between the OEM and OS Giken gear ratios for RB25/RB26 FS5R30A gearboxes:

                   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       1.000
5th Gear   0.752       0.826

Q:How durable are the OS Giken gear components?

OS Giken gear components are crafted using high-quality forged materials, ensuring exceptional strength and durability. They are designed to withstand the demanding conditions of high-performance driving, providing long-lasting reliability.

Q;Is professional installation recommended for the gear kit?

While installation procedures may vary, we highly recommend professional installation by experienced mechanics or gearbox specialists. Proper installation ensures optimal performance, reliability, and longevity of the gear kit.

Q:Does the gear kit come with a warranty?

OS Giken offers a warranty for their products, but the specific terms and conditions may vary. We recommend contacting OS Giken or referring to the product documentation for detailed information regarding the warranty coverage and duration.

Founder Masaharu Okazaki founded the Okazaki Speed ​​Technology Research Institute. In the early 1970s, while tuning motorcycles and automobiles on the market, his lifework, high rpm, high output, gathered the best of his own theory and technology. Succeeded in developing the original engine TC16-MA1. However, because of its high output, the off-the-shelf clutch, transmission, and differential gear that transmits power to the final drive wheels make noise. In order to transmit the maximum output of the engine to the end, his extraordinary passion that "if it breaks, make something that won't break" and the belief that "you won't know until you try" continue to today's OS Giken. It has been inherited and transformed into products.