Which cars does the Super Lock LSD for Alfa 1750 fit?

The Super Lock LSD for Alfa 1750 is listed by Turn 14 for F105 Alfa Romeo models with 1300, 1600 and 1750cc engines and a manual gearbox. Many classic Alfas have had axle changes over the years, so confirm the axle in your car before ordering.

Is it suitable for historic 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 historic series limit which differentials may be used. A tuned unit can be set milder or stronger for the circuit.

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

No. The pressure ring design is built for smooth, progressive locking rather than an abrupt grab. Expect some noise in tight parking maneuvers compared to an open differential, but the car stays easy to drive, and regular oil changes keep it quiet.

Can it be rebuilt later?

Yes. OS Giken services Super Lock units and can rebuild them with new friction plates, and can retune the springs and ramp angles if the car changes use. That makes it a long-term part for a car that may be kept for decades.

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 race use. Fresh oil keeps the friction plates working consistently, reduces chatter and helps the unit last longer between rebuilds.

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Description

OS Giken Super Lock LSD for Alfa 1750, 1300 and 1600 105-Series Manual

OS Giken’s Super Lock LSD for Alfa 1750, 1300 and 1600 engines is a plate-type limited-slip differential for the 105-series Alfa Romeo Giulia family with manual gearboxes, as listed by Turn 14 under the F105 code. These light, rear-drive classics are widely raced in historic series and driven hard on the road, and an open differential lets the inside rear wheel spin away drive out of tight corners. The Super Lock ties the rear wheels together progressively through a patented pressure ring, so the car drives out of corners rather than spinning a tire and stays settled over uneven surfaces. It is a new, rebuildable differential for a car that may be kept and raced for decades.

Matching the Unit to the Engine Size

OS Giken lists two units for these cars. This one covers the 1300, 1600 and 1750cc models. A separate unit for 2000cc cars is listed on its own page, so confirm the engine size and rear axle fitted to your car before ordering.

Features

Patented OS Giken pressure ring for smooth, progressive lock
Spline-through-side-gear design fits more friction plates
Up to twice the friction plates of competing designs
Chemically heat-treated, high-grade steel alloy components
Retunable and rebuildable by OS Giken
Listed for 1300, 1600 and 1750cc F105 cars with manual gearbox

Applications

Alfa Romeo 105-series (F105): 1300, 1600 and 1750cc, manual transmission

Notes

This Super Lock LSD for Alfa 1750, 1300 and 1600 cars is for manual-transmission cars
Rear axles in classic Alfas may have been swapped; confirm the axle fitted before ordering
Installation labor is not included

Frequently Asked Questions

Which cars does the Super Lock LSD for Alfa 1750 fit? The Super Lock LSD for Alfa 1750 is listed by Turn 14 for F105 Alfa Romeo models with 1300, 1600 and 1750cc engines and a manual gearbox. Many classic Alfas have had axle changes over the years, so confirm the axle in your car before ordering.
Is it suitable for historic 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 historic series limit which differentials may be used. A tuned unit can be set milder or stronger for the circuit.
Will it make the car harder to drive on the road? No. The pressure ring design is built for smooth, progressive locking rather than an abrupt grab. Expect some noise in tight parking maneuvers compared to an open differential, but the car stays easy to drive, and regular oil changes keep it quiet.
Can it be rebuilt later? Yes. OS Giken services Super Lock units and can rebuild them with new friction plates, and can retune the springs and ramp angles if the car changes use. That makes it a long-term part for a car that may be kept for decades.
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 race use. Fresh oil keeps the friction plates working consistently, reduces chatter 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

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 Alfa 1750, 1300 and 1600 105-Series Manual [AR081-HA]

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OS Giken Super Lock LSD for Alfa 1750, 1300 and 1600 105-Series Manual

Matching the Unit to the Engine Size

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews