How do I know whether the Super Lock LSD for S550 cars with 34-spline axles fits?

The spline count is set by the axle shafts fitted to the 8.8-inch IRS, which varied with model and option. Check the axle shafts or the build specification before ordering. This Super Lock LSD for S550 cars is for 34-spline axles, while 31-spline axles take part number FD881-HA.

Is it strong enough for a supercharged Coyote?

The Super Lock carries up to twice the friction plates of competing designs, giving it the clamping area for high torque. OS Giken can raise initial torque for drag use and fit TCD spec discs for oil cooling when the car is run hard and often.

Is it a good drift differential?

Yes. Locking both rear wheels under power is what makes slides easy to start, hold and link. The S550 independent rear suspension with a clutch-type differential makes a capable drift platform, and OS Giken can retune the unit for a more aggressive setting.

What changes on a road course?

The car drives harder out of slow corners because both rear tires keep transmitting torque as the inside one unloads, and the stability system intervenes less. The difference is most noticeable in tight, second-gear corners. That is where the gain is largest.

Will it affect daily driving?

Very little. OS Giken sets the Super Lock with a modest preload, and its Japanese catalogue rates the design among the quietest LSDs in town. Some plate engagement in tight parking turns is normal for a clutch-type differential. Commuting is unaffected.

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Description

OS Giken Super Lock LSD for S550 Ford Mustang 8.8in IRS 34-Spline

OS Giken’s Super Lock LSD for S550 Ford Mustang 8.8in IRS 34-Spline fits the independent rear axle Ford introduced with the sixth-generation Mustang, built for cars running the 34-spline axle shafts of the Super 8.8 unit. The S550 was the first Mustang with independent rear suspension on every model, and it is now a common base for supercharged Coyote builds and drift cars, both of which overwhelm the factory differential the moment an inside rear tire unloads. OS Giken’s patented pressure ring locks progressively as torque builds. It suits an S550 headed to the drag strip, drift events or road courses.

Fitment Notes

OS Giken and Turn 14 list this unit for the 8.8-inch IRS with 34-spline axles. Ford built 8.8-inch IRS units with different spline counts, so confirm the axle spline count before ordering; 31-spline 8.8-inch IRS axles take a separate OS Giken part.

Features

Clutch-type unit for the S550 8.8-inch IRS
Sized for 34-spline axle shafts
Patented pressure ring for progressive lock with torque
Up to twice the friction plates of competing designs
Billet case and raw-forged gears
Retunable for drag, drift or circuit use

Applications

Ford Mustang: S550 | 2015-2023 | 8.8-inch IRS, 34-spline axles

Notes

The Super Lock LSD for S550 cars in this listing is for 34-spline axles; 31-spline 8.8-inch IRS axles take part number FD881-HA
Installation labor is not included

Frequently Asked Questions

How do I know whether the Super Lock LSD for S550 cars with 34-spline axles fits? The spline count is set by the axle shafts fitted to the 8.8-inch IRS, which varied with model and option. Check the axle shafts or the build specification before ordering. This Super Lock LSD for S550 cars is for 34-spline axles, while 31-spline axles take part number FD881-HA.
Is it strong enough for a supercharged Coyote? The Super Lock carries up to twice the friction plates of competing designs, giving it the clamping area for high torque. OS Giken can raise initial torque for drag use and fit TCD spec discs for oil cooling when the car is run hard and often.
Is it a good drift differential? Yes. Locking both rear wheels under power is what makes slides easy to start, hold and link. The S550 independent rear suspension with a clutch-type differential makes a capable drift platform, and OS Giken can retune the unit for a more aggressive setting.
What changes on a road course? The car drives harder out of slow corners because both rear tires keep transmitting torque as the inside one unloads, and the stability system intervenes less. The difference is most noticeable in tight, second-gear corners. That is where the gain is largest.
Will it affect daily driving? Very little. OS Giken sets the Super Lock with a modest preload, and its Japanese catalogue rates the design among the quietest LSDs in town. Some plate engagement in tight parking turns is normal for a clutch-type differential. Commuting is unaffected.

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 S550 Ford Mustang 8.8in IRS 34-Spline [FD895-HA]

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OS Giken Super Lock LSD for S550 Ford Mustang 8.8in IRS 34-Spline

Fitment Notes

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

Reviews