The 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. The Bevel and planet gear pack has been designed to be the smoothest mesh, biggest and strongest tooth profile that we have ever been involved with. Eliminating the rattle, and excessive back lash of other units. Also With the added benefit of dual ramps. Dual Ramps available are 30/90, 40/90, 30/60, 45/45, 50/90