What is in the R4C Overhaul Kit B for JZA80 kit?

The R4C Overhaul Kit B for JZA80 kit contains all 4 clutch discs, the center plates, the pressure plate and a set of cover bolts, plus a new clutch cover. Overhaul Kit A has the same parts without the cover, for clutches where the original cover is still in good condition.

Should I choose Overhaul Kit A or Overhaul Kit B?

Choose Kit A when the existing R cover is in good condition, with no heat damage and a healthy diaphragm, because it costs less and reuses a part that still works. Choose Kit B when the cover shows wear or heat marks, or when the clutch has seen enough use that a full refresh makes sense.

Will this kit rebuild a different OS Giken clutch?

No. This kit is matched to the R4C clutch, part number TY031-DH5, for the JZA80 Supra. Other OS Giken series use different covers, discs and plates, and each has its own overhaul kit, so the kit should always match the clutch part number.

How do I know my clutch needs rebuilding?

The usual signs are slip under full load, an engagement point that has moved, or new judder on take-off. Wear depends heavily on launches, track use and power level, so there is no fixed interval. When any of those signs appear, a rebuild with fresh discs and plates restores the original behavior.

Why does Turn 14 describe this as a clutch?

Turn 14 lists TY031-DH50B with a clutch description, but OS Giken USA sells this part number as Overhaul Kit B for the R4C clutch TY031-DH5, and it is priced accordingly. We follow the manufacturer listing; our team can confirm before you order.

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Description

OS Giken R4C Overhaul Kit B for JZA80 Toyota Supra 2JZ-GTE, Quad Plate

OS Giken’s R4C Overhaul Kit B for JZA80 Supra clutches is the complete rebuild for the R4C quad plate race clutch: all four 215mm discs, the three center plates, the pressure plate, the cover bolts and a new R series cover. The R4C lives a hard life in drift, drag and roll-racing Supras, where repeated launches and heat cycles wear the friction stack and tire the diaphragm spring together. Kit B renews both, returning the clutch to the capacity OS Giken USA rates at up to about 1,400 lb-ft. Turn 14 lists this part under a clutch description, but OS Giken USA sells TY031-DH50B as the Overhaul Kit B for the TY031-DH5.

Rebuild Between Seasons

Competition clutches are best rebuilt on a schedule rather than after they start to slip, since slipping under load generates the heat that damages covers and flywheels. Kit B replaces everything in the stack, cover included. If the cover is still sound, OS Giken’s Overhaul Kit A for this clutch (TY031-DH50A) reuses it.

Features

Restores a worn R4C clutch to full clamping capacity
Matched discs, center plates and pressure plate replaced together
New R cover with a fresh diaphragm spring
Four 215mm discs to the original R4C specification

What’s Included

Clutch discs (x4)
Center plates (x3)
Pressure plate
Clutch cover
Cover bolt set

Applications

Toyota Supra: JZA80 | 1993-1998 | 3.0L 2JZ-GTE twin turbo

Notes

This R4C Overhaul Kit B for JZA80 kit rebuilds the OS Giken R4C Clutch for JZA80 Toyota Supra and does not fit other OS Giken clutch series
Includes a new cover; Overhaul Kit A (TY031-DH50A) reuses a healthy cover for less
Kit contents are as OS Giken dealers list them for Overhaul Kit B
Installation labor is not included

Frequently Asked Questions

What is in the R4C Overhaul Kit B for JZA80 kit? The R4C Overhaul Kit B for JZA80 kit contains all 4 clutch discs, the center plates, the pressure plate and a set of cover bolts, plus a new clutch cover. Overhaul Kit A has the same parts without the cover, for clutches where the original cover is still in good condition.
Should I choose Overhaul Kit A or Overhaul Kit B? Choose Kit A when the existing R cover is in good condition, with no heat damage and a healthy diaphragm, because it costs less and reuses a part that still works. Choose Kit B when the cover shows wear or heat marks, or when the clutch has seen enough use that a full refresh makes sense.
Will this kit rebuild a different OS Giken clutch? No. This kit is matched to the R4C clutch, part number TY031-DH5, for the JZA80 Supra. Other OS Giken series use different covers, discs and plates, and each has its own overhaul kit, so the kit should always match the clutch part number.
How do I know my clutch needs rebuilding? The usual signs are slip under full load, an engagement point that has moved, or new judder on take-off. Wear depends heavily on launches, track use and power level, so there is no fixed interval. When any of those signs appear, a rebuild with fresh discs and plates restores the original behavior.
Why does Turn 14 describe this as a clutch? Turn 14 lists TY031-DH50B with a clutch description, but OS Giken USA sells this part number as Overhaul Kit B for the R4C clutch TY031-DH5, and it is priced accordingly. We follow the manufacturer listing; our team can confirm before you order.

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 Overhaul Kit B for JZA80 Toyota Supra 2JZ-GTE, Quad Plate [TY031-DH50B]

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OS Giken R4C Overhaul Kit B for JZA80 Toyota Supra 2JZ-GTE, Quad Plate

Rebuild Between Seasons

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews