Which Super Lock LSD for S13 cars do I need, JDM or USDM?

This Super Lock LSD for S13 and S14 cars, part number NS044-HA, is the Japanese-market unit for SR20 Silvias and the 180SX. US-market KA24DE 240SX cars take NS046-HA. A 240SX that has been converted with Japanese drivetrain parts may need either, so check the differential fitted.

Is it good for drifting?

Yes. A clutch-type rear differential locks both rear wheels under power, making a slide easier to start, hold and link than with an open or viscous unit. OS Giken can retune initial torque and lock timing for a more aggressive drift setting.

Will it fit a Skyline?

Turn 14 lists R32 and R33 RB20 and RB25 Skylines for this part number as well as the Silvia, while OS Giken USA lists the Silvia. Bulletproof Automotive recommends confirming fitment before ordering for a Skyline, because rear differential sizes varied between models.

How does it compare with a welded differential?

A welded differential is permanently locked, which makes the car hard to drive on the road and stresses axles and tires. The Super Lock unlocks when cruising and locks under power, so the car stays drivable on the street and still slides predictably.

Can it be rebuilt later?

Yes. The friction plates are a wear part, and OS Giken rebuilds and retunes Super Lock units in-house, so the differential can be refreshed after hard drift seasons and the setting adjusted as the car changes. That keeps running costs predictable.

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Description

OS Giken Super Lock LSD for S13 / S14 Nissan Silvia and 180SX

OS Giken’s Super Lock LSD for S13 / S14 Nissan Silvia and 180SX is the Japanese-market unit for the SR20-engined cars, as opposed to the US-specification 240SX version. The S13 and S14 Silvia and the 180SX are long-standing drift platforms, and the open or viscous rear differentials they left the factory with let the inside tire spin the moment the car is sideways. OS Giken’s patented pressure ring locks progressively under power, so a slide is easier to start, hold and link, and grip-car exits are stronger. It is the drivetrain part to fit before chasing power on an SR20 build.

Design and Performance

OS Giken carries the friction plates on splines through the side gears, fitting up to twice as many as competing designs. That clamping area allows a modest preload for the road and full, progressive lock under power. Gears are raw-forged and every part is chemically heat treated in a billet case.

Features

Japanese-market unit for SR20 Silvia and 180SX
Patented pressure ring for progressive lock under power
Up to twice the friction plates of competing designs
Suited to drift and grip setups alike
Billet case and raw-forged gears
Retunable by OS Giken as the build develops

Applications

Nissan 180SX: RPS13 | 1991-1998 | 2.0L SR20DET
Nissan Silvia: S13 | 1991-1993 | 2.0L SR20DE / SR20DET
Nissan Silvia: S14 | 1993-1998 | 2.0L SR20DE / SR20DET

Notes

The Super Lock LSD for S13 and S14 Japanese-market cars differs from the US-specification 240SX unit, part number NS046-HA
Turn 14 also names R32 and R33 RB20 and RB25 Skylines for this part; confirm before ordering for a Skyline
Listed for manual-transmission cars; installation labor is not included

Frequently Asked Questions

Which Super Lock LSD for S13 cars do I need, JDM or USDM? This Super Lock LSD for S13 and S14 cars, part number NS044-HA, is the Japanese-market unit for SR20 Silvias and the 180SX. US-market KA24DE 240SX cars take NS046-HA. A 240SX that has been converted with Japanese drivetrain parts may need either, so check the differential fitted.
Is it good for drifting? Yes. A clutch-type rear differential locks both rear wheels under power, making a slide easier to start, hold and link than with an open or viscous unit. OS Giken can retune initial torque and lock timing for a more aggressive drift setting.
Will it fit a Skyline? Turn 14 lists R32 and R33 RB20 and RB25 Skylines for this part number as well as the Silvia, while OS Giken USA lists the Silvia. Bulletproof Automotive recommends confirming fitment before ordering for a Skyline, because rear differential sizes varied between models.
How does it compare with a welded differential? A welded differential is permanently locked, which makes the car hard to drive on the road and stresses axles and tires. The Super Lock unlocks when cruising and locks under power, so the car stays drivable on the street and still slides predictably.
Can it be rebuilt later? Yes. The friction plates are a wear part, and OS Giken rebuilds and retunes Super Lock units in-house, so the differential can be refreshed after hard drift seasons and the setting adjusted as the car changes. That keeps running costs predictable.

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 Super Lock LSD for S13 / S14 Nissan Silvia and 180SX [NS044-HA]

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OS Giken Super Lock LSD for S13 / S14 Nissan Silvia and 180SX

Design and Performance

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews