3J NXG Focus ST MK3 differentialThe 3J plate pack always run with 8 active surfaces, even in our lighter settings, giving maximum surfaces and surface area contact during use. Our new pre load spacer helps generate the pre load. Rather than just have the 2 or 3 settings of other units, we can 'fine tune' to particular pre load settings complemented with our choice of ramps, to get the perfect LSD set up for you!