The LSD Inspection/Service Form below must be filled out immediately after purchase.
CLICK HERE - LSD Tuning Form *MANDATORY*
This service is to cover the labor for LSD inspection, service, retune, refresh, and rebuilds only.
****Special pricing is for purchases made through US Sales Channels only. Proof of purchase maybe required upon inspection. Additional fees maybe applied after inspection****
One would purchase this service voucher to be applied to NEW or USED OS Giken Super Lock LSD's. It is the responsibility of the end user to ship their LSD unit to us, the service includes ground shipping return to Domestic (USA) 48 State only.
The LSD must not have the ring gear attached. The side bearings can remain on as it does not hinder us from servicing the unit.
Please note for INTERNATIONAL shipments, taxes and duties MUST be paid by the sender.
*Warning: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to: www.P65warnings.ca.gov/
Our revolutionary pressure ring houses our patented lock timing system, where springs work in opposition of torque being applied to the LSD. This results in a progressive, smooth, and quiet operation of the clutch discs within the differential. Furthermore, by modifying the spring rate, the rate of which the differential reaches full lock can be adjusted to suit particular vehicle settings and racing styles.
Unlike other manufacturers that utilize modular components, we produce our cams and pressure rings as matching sets. Because the faces of the cams are grounded exactly to match the application area of the pressure ring, torque transfer is smooth and consistent throughout the lock range.
The unique “spline-through” side gears allows our LSD to house more clutch discs than other competitors. Also, due to the relatively large size, it provides superior durability and torque transfer.
The discs are precision-machined simultaneously on both sides to extremely tight tolerances to reduce flatness deviations and to eliminate the need to perform the tedious “figure 8” break-in period. By using as much as twice as many clutch discs than competing brands, our differential provides superior torque hold, while also reducing the “clunkiness” of traditional clutch-type LSDs. This also results in enhanced durability and reduced wear as torque hold is spread out over a higher amount of friction surfaces.
The case and all components are constructed from a high-grade steel alloy, and then chemically heat treated for increased durability. The extra rigidity created ensures that the internal components stay within their tight tolerances, allowing the differential to function with watch-like precision.
The “Pre-Order” order option is enabled when the listed item is either temporarily out of stock, or is only available as a “built to order” item from our factory.
Once an order for a “Pre-Order” item is received, we will confirm lead-time with our Japan factory and contact you within 1-2 business days via email with current projected production lead-time information and delivery date projections. After accepted/authorized we will proceed with finalizing your order. If the quoted lead-time is not accepted, the order will be promptly cancelled and you will be refunded immediately in full.
If there is further delay after your placed order, we will contact you with an updated delivery lead-time or provide you with the option to cancel with a full refund for any unfulfilled order items.
While there is no risk in ordering “Pre-Order” items through our website, feel free to contact us ahead of time regarding product leadtime.
California Prop 65 Warning
*Warning: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to: www.P65warnings.ca.gov
Have your OS Super Lock LSD custom tuned to specifically match your vehicle's performance
Choose the right gear oil to ensure your OS SuperLock LSD performs properly
Using a metal alignment tool is key to proper installation of any race multi-plate clutch