I'm with 1stduece. Eaton Detroit True Trac is the ticket, if they make it for your application. It's an all gear (no clutches to wear out) Torque biasing limited slip that is very transparent until you need it and then it sends the most drive to the wheel on that axle that has the MOST traction, not the LEAST like L.S.'s do. Its the simplest design with the least amount of breakable parts. I've had every locker and limited slip made, except the OX Locker and the Gov-Lok and find full, automatic lockers are a pain on the back of an empty pickup, especially on ice. One problem is torque steer. When accelerating into a curve, you get what's called over steer: the tendency to keep going straight and resist the turn. If you let off the throttle suddenly, you get the opposite reaction which is called under steer: the tendency to cut sharper than you want into the curve. In extreme cases, this woe can be a handful and is not for the faint of heart. True lockers are hard on your axles, T. Case, and U-joints. For occasional hard core off roaders, it's not worth it when you take into account the drivability issues. I recently replaced my rear 35 spline, Dana 80 Power Lok with another True Trac. It is so transparent on the highway, winding or not. With True Tracs on both ends, I've been in several feet of snow and all four just keep churning away without letup. In deep sand, the same thing: all four turning the same speed. Truly amazing.
For absolute, solid, straight across locking diffs, whether axle twisting or raising a wheel off the ground, I still like ARB's. They are not without their foibles. If it's real dusty, it can clog your compressor filter and wreak havoc on your toggle switches. I've had hoses dragged off by passing shrubs.
Bottom line is: how much really hard core stuff do you do? If a LOT of axle twisting:

If a lot of stuff like this: (my old CJ-8 in Helldorado Canyon, Moab; front axle entirely off the ground/rrear tire against a rock and lrear tire climbing over a big rock) ARB's do well.

jefe