A limited slip differential axle assembly includes a plurality of pressure plate segments which are electromagnetically biased against friction discs of clutch packs secured to side gears of the differential. In a preferred form, the assembly is formed of a two-piece of "split" differential case and...http://www.google.com/patents/US4776234?utm_source=gb-gplus-sharePatent US4776234 - Modulating bias control for limited slip differential axle
