Why does the automatic 370Z need its own Super Lock LSD for Z34 cars?

The seven-speed automatic 370Z uses a 3.357 final drive, a different ratio from the manual car, so OS Giken builds a separate Super Lock LSD for Z34 automatic cars, part number NS114-HA. Manual cars take NS111-HA or NS112-HA depending on whether they left the factory with a viscous LSD or an open differential.

Is a limited-slip differential worth it on an automatic Z?

Yes, if the car is driven hard. The automatic delivers torque smoothly, but once the inside rear tire unloads mid-corner the factory differential lets it spin. A clutch-type unit keeps both tires driving, so the car exits corners with more speed and less intervention.

Can an automatic 370Z be drifted with this fitted?

Yes. The Super Lock locks both rear wheels under power, which is what lets a car hold a slide. Many automatic Zs are used at drift days, and OS Giken can retune initial torque and lock timing for a more aggressive feel.

Does it fit the 350Z automatic?

OS Giken USA lists part number NS114-HA for the Z34 370Z automatic with the 3.357 final drive. Other automatic Zs are not listed for this unit, so Bulletproof Automotive recommends confirming the final drive ratio of the car before ordering.

How quiet is it in daily driving?

OS Giken designs the Super Lock around a low preload, and its Japanese catalogue rates it among the quietest LSDs in city driving. On an automatic car used for commuting, the difference in normal driving is small; it shows at the limit of grip.

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Description

OS Giken Super Lock LSD for Z34 Nissan 370Z Automatic with 3.357 Final Drive

OS Giken’s Super Lock LSD for Z34 Nissan 370Z Automatic with 3.357 Final Drive is the clutch-type rear differential for the seven-speed automatic Z, which uses a taller final drive than the manual car and so needs its own unit. Automatic 370Zs are often bought as daily drivers and later taken to the track or a drift day, where the factory differential lets the inside rear tire spin as soon as the VQ37VHR is asked for its full torque mid-corner. OS Giken’s patented pressure ring locks progressively as torque builds. For an automatic Z that is starting to see real use at the limit, this is the drivetrain upgrade to make first.

Design and Performance

With its plates carried on splines that pass through the side gears, the Super Lock fits up to twice the friction plates of competing designs. That lets OS Giken set a mild preload for commuting and still deliver full, progressive lock on throttle. Gears are raw-forged and chemically heat treated in a case machined from a single billet.

Features

Built for the 3.357 final drive of the automatic 370Z
Clutch-type lock that rises with torque
Up to twice the friction plates of competing designs
Mild preload for a daily-driven car
Billet case and raw-forged, heat-treated gears
Retunable by OS Giken as the car develops

Applications

Nissan 370Z: Z34 | 2009-2020 | 3.7L VQ37VHR, seven-speed automatic

Notes

The Super Lock LSD for Z34 automatic cars matches the 3.357 final drive; manual Zs take part number NS111-HA or NS112-HA
Installation labor is not included

Frequently Asked Questions

Why does the automatic 370Z need its own Super Lock LSD for Z34 cars? The seven-speed automatic 370Z uses a 3.357 final drive, a different ratio from the manual car, so OS Giken builds a separate Super Lock LSD for Z34 automatic cars, part number NS114-HA. Manual cars take NS111-HA or NS112-HA depending on whether they left the factory with a viscous LSD or an open differential.
Is a limited-slip differential worth it on an automatic Z? Yes, if the car is driven hard. The automatic delivers torque smoothly, but once the inside rear tire unloads mid-corner the factory differential lets it spin. A clutch-type unit keeps both tires driving, so the car exits corners with more speed and less intervention.
Can an automatic 370Z be drifted with this fitted? Yes. The Super Lock locks both rear wheels under power, which is what lets a car hold a slide. Many automatic Zs are used at drift days, and OS Giken can retune initial torque and lock timing for a more aggressive feel.
Does it fit the 350Z automatic? OS Giken USA lists part number NS114-HA for the Z34 370Z automatic with the 3.357 final drive. Other automatic Zs are not listed for this unit, so Bulletproof Automotive recommends confirming the final drive ratio of the car before ordering.
How quiet is it in daily driving? OS Giken designs the Super Lock around a low preload, and its Japanese catalogue rates it among the quietest LSDs in city driving. On an automatic car used for commuting, the difference in normal driving is small; it shows at the limit of grip.

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 Z34 Nissan 370Z Automatic with 3.357 Final Drive [NS114-HA]

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OS Giken Super Lock LSD for Z34 Nissan 370Z Automatic with 3.357 Final Drive

Design and Performance

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews