Description Reviews PLEASE NOTE, THIS ITEM IS ON BACKORDER AND YOU WOULD RECEIVE IT WITHIN 4 TO 6 WEEKS FROM THE ORDER DATE. We apologize if this causes any inconvenience. OS Giken utilized its accumulated racing knowledge and engineering experience to develop its own limited slip differential (LSD). Four years of extensive research and development lead to a new and revolutionary LSD design with the capacity to house an unprecedented number of friction plates (up to 28 plates in total), and thus the OS Super Lock LSD was born. The increased number of plates has not only dramatically improved their LSD design's locking force, and it also enables it to fully lock. An added benefit to being a full locking mechanism is that less heat is generated, thus resulting in incredible durability and reliability. As expected from OS Giken, their LSDs are not only made from the highest quality materials, precise machining, forged gears, and sound engineering. This makes their LSDs the most durable and reliable race performance LSDs available. OS Giken recommends this fluid for use with their LSD's. In addition, their design allows for the initial torque setting and lock timing to be customized to best fit your vehicle's ever changing set-up and course/road conditions. (Limited to Spec-X LSDs only) Note: When installing an LSD, don't forget to buy a set of bearings. This is the 1.5 Way Unit.