Which cars does the Super Lock LSD for Narrow 911 fit?

OS Giken Japan lists the Super Lock LSD for Narrow 911 cars for the 901-series 911 with a five-speed manual. OS Giken USA names the 911 and 914 narrow, and Turn 14 lists 1969 to 1971 911 and 1970 to 1976 914 fitment. Confirm your gearbox before ordering.

Does it fit the later 915 gearbox?

No. The 915 gearbox used from the early 1970s takes a different unit, offered by OS Giken in fine-spline and coarse-spline versions. Confirm which gearbox is in your car before ordering, since many early cars have had gearbox changes. Our team can help check it.

Is it suitable for vintage racing?

Yes. A plate-type LSD keeps both rear wheels driving out of slow corners and gives consistent behavior lap after lap. Check the rules for your class first, since some vintage series limit which differentials may be used. A tuned unit can be set milder or stronger.

Will it make the car harder to drive on the road?

No. OS Giken designed the Porsche Super Lock to suit both circuit and street use, moving smoothly from open to full lock, with pressure ring springs set to reduce drag at low speed. Expect some noise in tight parking maneuvers.

Can OS Giken tune it for my car?

Yes. OS Giken retunes Super Lock units in-house. Cone springs set initial torque, pressure ring springs set how quickly full lock arrives, and the pressure ring and iron cross set the ramp angles, so the unit can be matched to weight, power and use.

What oil should be used?

Use a gear oil suited to clutch-type limited-slip differentials, and change it more often than with an open differential, especially after track use. Fresh oil keeps the friction plates working consistently, reduces chatter during slow turns and helps the unit last longer between rebuilds.

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Description

OS Giken Super Lock LSD for Narrow 911 and Porsche 914 Manual

OS Giken’s Super Lock LSD for Narrow 911 cars is a plate-type limited-slip differential for the early narrow-body Porsche 911 and, per OS Giken USA and Turn 14, the Porsche 914. OS Giken Japan lists it for the 901-series narrow 911 with a five-speed manual from 1964, and Turn 14 lists 1969-1971 911 and 1970-1976 914 fitment. These light, rear-engined and mid-engined cars are raced in vintage series and driven hard on the road, and an open differential lets the inside rear wheel spin away drive on corner exit. The Super Lock builds lock smoothly and progressively, putting power down evenly and keeping the rear settled.

New Hardware for an Early Porsche

Differentials in cars of this age have often seen decades of use. A new Super Lock gives a vintage race car or a fast road car a fresh, rebuildable differential that OS Giken can tune for the car and still service with new plates when they wear.

Features

Patented OS Giken pressure ring for smooth, progressive lock
Moves smoothly from open to full lock without extra slip on throttle
Pressure ring springs tuned against low-speed drag
Large-capacity friction plates and OS Giken side gear shape
Chemically heat-treated, high-grade steel alloy components
Listed for the narrow 911 and the 914 with manual gearbox

Applications

Porsche 911 (narrow body): 901-series, five-speed manual
Porsche 914: Manual transmission, listed 1970-1976

Notes

This Super Lock LSD for Narrow 911 and 914 cars is for manual-transmission cars
Gearboxes in early cars may have been swapped; confirm the gearbox fitted before ordering
Installation labor is not included

Frequently Asked Questions

Which cars does the Super Lock LSD for Narrow 911 fit? OS Giken Japan lists the Super Lock LSD for Narrow 911 cars for the 901-series 911 with a five-speed manual. OS Giken USA names the 911 and 914 narrow, and Turn 14 lists 1969 to 1971 911 and 1970 to 1976 914 fitment. Confirm your gearbox before ordering.
Does it fit the later 915 gearbox? No. The 915 gearbox used from the early 1970s takes a different unit, offered by OS Giken in fine-spline and coarse-spline versions. Confirm which gearbox is in your car before ordering, since many early cars have had gearbox changes. Our team can help check it.
Is it suitable for vintage racing? Yes. A plate-type LSD keeps both rear wheels driving out of slow corners and gives consistent behavior lap after lap. Check the rules for your class first, since some vintage series limit which differentials may be used. A tuned unit can be set milder or stronger.
Will it make the car harder to drive on the road? No. OS Giken designed the Porsche Super Lock to suit both circuit and street use, moving smoothly from open to full lock, with pressure ring springs set to reduce drag at low speed. Expect some noise in tight parking maneuvers.
Can OS Giken tune it for my car? Yes. OS Giken retunes Super Lock units in-house. Cone springs set initial torque, pressure ring springs set how quickly full lock arrives, and the pressure ring and iron cross set the ramp angles, so the unit can be matched to weight, power and use.
What oil should be used? Use a gear oil suited to clutch-type limited-slip differentials, and change it more often than with an open differential, especially after track use. Fresh oil keeps the friction plates working consistently, reduces chatter during slow turns and helps the unit last longer between rebuilds.

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 Super Lock LSD for Narrow 911 and Porsche 914 Manual [PR011-HA]

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OS Giken Super Lock LSD for Narrow 911 and Porsche 914 Manual

New Hardware for an Early Porsche

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews