When do I need the 26-Spline R4C Clutch for R32 and R33 cars?

Choose the 26-Spline R4C Clutch for R32 and R33 GT-R builds when the gearbox behind the RB26DETT has a 26-spline input shaft. All four disc hubs must match the input shaft, so confirm the spline count or the gearbox model before ordering. Our team can help check it.

How much power will it hold?

OS Giken USA rates this R4C at about 1,400 lb-ft of torque, and OS Giken Japan places the R series in its 700 PS class, the highest in its clutch range. It is meant for heavily built engines well beyond the reach of twin plate clutches.

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. There is no D suffix; the R series uses the OS Giken floating dampened center hub instead, built to withstand transmission shock.

Is it usable on the street?

It can be driven on the road, but it is a race clutch. Engagement is firm and abrupt compared with a street twin plate, and the solid-hub discs pass more noise and driveline shock. Most owners fit it to cars used mainly at events.

Can it be rebuilt when it wears?

Yes. OS Giken offers Overhaul Kit A for this clutch, with the discs, center plates, pressure plate and cover bolts, and Overhaul Kit B, which adds a new cover. Rebuilding restores full clamping capacity for less than a complete new kit.

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Description

OS Giken 26-Spline R4C Clutch for R32 / R33 Nissan Skyline GT-R, Quad Plate

OS Giken’s 26-Spline R4C Clutch for R32 and R33 Skyline GT-R builds is the quad plate R series race clutch with 26-spline disc hubs, for an RB26DETT bolted to a gearbox with a 26-spline input shaft. It uses four 215mm discs in OS Giken’s highest capacity cover series, and OS Giken USA rates this version at about 1,400 lb-ft. The R series was designed for cars with a large increase in engine power, with a floating center hub built to take the transmission shock of a high-powered race car. It suits drag, roll-racing and time attack GT-Rs that have moved to a stronger gearbox.

Matching the Clutch to an Upgraded Gearbox

Big-power GT-R builds often replace the factory gearbox, and the clutch disc spline has to match whatever input shaft is behind it. This kit carries 26-spline hubs on all four discs. The standard-spline R4C is listed separately, so count the input shaft splines before choosing between them.

Features

Four 215mm discs with 26-spline hubs
R series cover with floating center hub construction
Rated by OS Giken USA at about 1,400 lb-ft
Built to withstand transmission shock in high-power cars
Rebuildable with OS Giken overhaul kits A and B

Applications

Nissan Skyline GT-R: BNR32 | 1989-1994 | 2.6L RB26DETT | 26-spline gearbox input
Nissan Skyline GT-R: BCNR33 | 1995-1998 | 2.6L RB26DETT | 26-spline gearbox input

Notes

This 26-Spline R4C Clutch for R32 and R33 GT-R builds needs a gearbox with a 26-spline input shaft
OS Giken rebuild parts for this clutch are Overhaul Kit A (NS201-DH510A) and Overhaul Kit B (NS201-DH510B)
Installation labor is not included

Frequently Asked Questions

When do I need the 26-Spline R4C Clutch for R32 and R33 cars? Choose the 26-Spline R4C Clutch for R32 and R33 GT-R builds when the gearbox behind the RB26DETT has a 26-spline input shaft. All four disc hubs must match the input shaft, so confirm the spline count or the gearbox model before ordering. Our team can help check it.
How much power will it hold? OS Giken USA rates this R4C at about 1,400 lb-ft of torque, and OS Giken Japan places the R series in its 700 PS class, the highest in its clutch range. It is meant for heavily built engines well beyond the reach of twin plate clutches.
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. There is no D suffix; the R series uses the OS Giken floating dampened center hub instead, built to withstand transmission shock.
Is it usable on the street? It can be driven on the road, but it is a race clutch. Engagement is firm and abrupt compared with a street twin plate, and the solid-hub discs pass more noise and driveline shock. Most owners fit it to cars used mainly at events.
Can it be rebuilt when it wears? Yes. OS Giken offers Overhaul Kit A for this clutch, with the discs, center plates, pressure plate and cover bolts, and Overhaul Kit B, which adds a new cover. Rebuilding restores full clamping capacity for less than a complete new kit.

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.

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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 26-Spline R4C Clutch for R32 / R33 Nissan Skyline GT-R, Quad Plate [NS201-DH51]

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OS Giken 26-Spline R4C Clutch for R32 / R33 Nissan Skyline GT-R, Quad Plate

Matching the Clutch to an Upgraded Gearbox

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews