When do I need the R4C Clutch for JZA80 26-Spline builds?

Choose the R4C Clutch for JZA80 26-Spline builds when the gearbox behind your engine has a 26-tooth GM-pattern input shaft. The disc spline must match that input exactly, so confirm the spline type and count before ordering. Our team can help with any questions.

How much power will it hold?

OS Giken USA rates the R4C at up to about 1,400 lb-ft of torque and immense amounts of heat, and OS Giken Japan places the R series in its 700 PS class. It is designed for competition engines in drift, drag and similar cars.

Why do Turn 14 and OS Giken USA describe it differently?

OS Giken USA titles this part for the JZA80 Supra with a 26t GM spline, while Turn 14 also mentions the 1JZ-GTE with an R154 gearbox. We follow the manufacturer and confirm fitment with OS Giken for any other combination.

It is the OS Giken model code. R is the cover series, 4 is the number of discs and C is the 215mm disc size. OS Giken USA describes the R4C center hub as floating and damped to absorb transmission shock.

Is it usable on the street?

It is a race clutch. Engagement is firm and abrupt, and it passes more noise and driveline shock than a street clutch. It suits cars used mainly at events or the track rather than daily driving. Our team can help with any questions.

Description

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Description

OS Giken R4C Clutch for JZA80 26-Spline GM Hub, Toyota Supra 2JZ-GTE Quad Plate

OS Giken’s R4C Clutch for JZA80 26-Spline builds is the quad plate R series race clutch with its discs splined for a 26-tooth GM-pattern input shaft, for a 2JZ-GTE driving a gearbox with that spline. OS Giken USA titles it for the JZA80 Supra with a 26t GM spline and rates the R4C at up to about 1,400 lb-ft of torque. Four 215mm discs and OS Giken’s floating, damped center hub are built to take the transmission shock of a high-powered race car, and OS Giken USA notes the R4C is often found in its competition drift and drag vehicles. It is built for the most powerful 2JZ race cars.

Spline and Release

OS Giken offers this 26-spline version alongside the standard R4C for JZA80, which suits the factory gearbox and needs a Movement Alteration Kit there. Turn 14 names no kit for this version, and its Turn 14 title also mentions the 1JZ-GTE with an R154 gearbox, so confirm your engine, gearbox and release system with our team.

Features

Four 215mm discs with 26-tooth GM-pattern spline hubs
Rated by OS Giken USA at up to about 1,400 lb-ft
Floating, damped center hub to absorb transmission shock
Used by OS Giken in competition drift and drag vehicles
Highest capacity series in the OS Giken range

Applications

Toyota Supra: JZA80 | 1993-1998 | 3.0L 2JZ-GTE | gearbox with 26-tooth GM-pattern input spline

Notes

This R4C Clutch for JZA80 26-Spline builds needs a gearbox with a 26-tooth GM-pattern input shaft
Turn 14 titles this part for a 1JZ-GTE with an R154 gearbox while OS Giken USA titles it for the JZA80; confirm fitment with our team
Installation labor is not included

Frequently Asked Questions

When do I need the R4C Clutch for JZA80 26-Spline builds? Choose the R4C Clutch for JZA80 26-Spline builds when the gearbox behind your engine has a 26-tooth GM-pattern input shaft. The disc spline must match that input exactly, so confirm the spline type and count before ordering. Our team can help with any questions.
How much power will it hold? OS Giken USA rates the R4C at up to about 1,400 lb-ft of torque and immense amounts of heat, and OS Giken Japan places the R series in its 700 PS class. It is designed for competition engines in drift, drag and similar cars.
Why do Turn 14 and OS Giken USA describe it differently? OS Giken USA titles this part for the JZA80 Supra with a 26t GM spline, while Turn 14 also mentions the 1JZ-GTE with an R154 gearbox. We follow the manufacturer and confirm fitment with OS Giken for any other combination.
What does R4C mean? It is the OS Giken model code. R is the cover series, 4 is the number of discs and C is the 215mm disc size. OS Giken USA describes the R4C center hub as floating and damped to absorb transmission shock.
Is it usable on the street? It is a race clutch. Engagement is firm and abrupt, and it passes more noise and driveline shock than a street clutch. It suits cars used mainly at events or the track rather than daily driving. Our team can help with any questions.

About OS Giken

OS Giken was founded in Okayama, Japan in 1973 by Masaharu Okazaki. It built the TC16 and TC24-B1 DOHC cylinder heads for Nissan L-series engines, began making multi-plate racing clutches in 1982 and started supplying OEM limited-slip differentials in 1983. Development of the Super Lock LSD began in 1997, and of the OS-88 sequential gearbox for the Skyline GT-R in 1998.

Additional Information

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Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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OS Giken R4C Clutch for JZA80 26-Spline GM Hub, Toyota Supra 2JZ-GTE Quad Plate [TY031-DH51]

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OS Giken R4C Clutch for JZA80 26-Spline GM Hub, Toyota Supra 2JZ-GTE Quad Plate

Spline and Release

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews