Should I choose the TCD LSD for GSE21 cars or the Super Lock?

Choose the TCD LSD for GSE21 cars if the IS350 is mainly a daily driver and refinement matters, because its oil-fed discs move between open and locked more smoothly and quietly. Choose the Super Lock, part number TY391-HA, if price matters more or the car is used mainly on track.

Does TCD reduce traction?

No. OS Giken states that TCD keeps the high traction and response of the Super Lock. The oil holes and channels in its discs change how smoothly it engages, not how strongly it locks under power, so corner-exit drive is the same.

Is this the unit OS Giken Japan lists for the IS350?

Yes. The OS Giken Japanese differential table lists the GSE21 IS350 under TCD. The Super Lock version for the same car is supplied through OS Giken USA and Turn 14, which is why both appear at Bulletproof Automotive. Either suits the GSE21 IS350.

Will it change how the car rides or sounds?

In normal driving the change should be hard to notice, which is the point of TCD. Its oil-fed discs are designed to reduce the noise and shock typical of mechanical LSDs, so the IS350 keeps its quiet character until the throttle is used hard in a corner.

Can the setting be changed later?

Yes. OS Giken notes that the cam angle on TCD units, which sets how the differential behaves on and off throttle, can be chosen freely, and it rebuilds and retunes its differentials in-house if the car or its use changes.

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Description

OS Giken TCD LSD for GSE21 Lexus IS350

OS Giken’s TCD LSD for GSE21 Lexus IS350 is the version of OS Giken’s limited-slip differential that suits a luxury sedan best, and it is the unit OS Giken’s own Japanese catalogue lists for the GSE21. The IS350’s 306 hp 2GR-FSE V6 overwhelms an unloaded inside rear tire on a tight exit, but a conventional clutch-type LSD can clunk and chatter in the traffic an IS350 spends most of its life in. TCD keeps the Super Lock’s pressure ring mechanism and feeds oil across the friction discs, so it locks firmly under power and stays quiet the rest of the time. Choose it for an IS350 that is driven every day and enjoyed on weekends.

How TCD Differs

TCD keeps the Super Lock mechanism but adds oil holes and channels to the friction discs, so the disc faces stay wet at all times. OS Giken says this lets the differential move smoothly between open and locked states, cutting the noise and shock typical of a mechanical LSD while keeping the Super Lock’s traction and response.

Features

TCD friction discs with oil holes and channels
Quiet, smooth behavior suited to a luxury sedan
Super Lock pressure ring for traction under power
Listed by OS Giken Japan for the GSE21
Billet case and raw-forged gears
Cam angle adjustable by OS Giken

Applications

Lexus IS350: GSE21 | 2006-2013 | 3.5L 2GR-FSE V6

Notes

The TCD LSD for GSE21 cars is the quieter alternative to the OS Giken Super Lock for the same car, part number TY391-HA
Installation labor is not included

Frequently Asked Questions

Should I choose the TCD LSD for GSE21 cars or the Super Lock? Choose the TCD LSD for GSE21 cars if the IS350 is mainly a daily driver and refinement matters, because its oil-fed discs move between open and locked more smoothly and quietly. Choose the Super Lock, part number TY391-HA, if price matters more or the car is used mainly on track.
Does TCD reduce traction? No. OS Giken states that TCD keeps the high traction and response of the Super Lock. The oil holes and channels in its discs change how smoothly it engages, not how strongly it locks under power, so corner-exit drive is the same.
Is this the unit OS Giken Japan lists for the IS350? Yes. The OS Giken Japanese differential table lists the GSE21 IS350 under TCD. The Super Lock version for the same car is supplied through OS Giken USA and Turn 14, which is why both appear at Bulletproof Automotive. Either suits the GSE21 IS350.
Will it change how the car rides or sounds? In normal driving the change should be hard to notice, which is the point of TCD. Its oil-fed discs are designed to reduce the noise and shock typical of mechanical LSDs, so the IS350 keeps its quiet character until the throttle is used hard in a corner.
Can the setting be changed later? Yes. OS Giken notes that the cam angle on TCD units, which sets how the differential behaves on and off throttle, can be chosen freely, and it rebuilds and retunes its differentials in-house if the car or its use changes.

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

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

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 TCD LSD for GSE21 Lexus IS350 [TY391-HC]

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OS Giken TCD LSD for GSE21 Lexus IS350

How TCD Differs

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

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