I did a little research on this a few years back for our rig but never ended up changing things out as the stock limited slip is working fine, but will prob go with this if I need to replace it. Unless you are wanting/needing full locker front/rear, which is a little overkill for us, adding an eaton Detroit truetrac in the rear is a good way to go, this works best for seamless daily driving without putting added stress on the driveline, you can always add a locker in the front if you need/want to...
Talk to Chris about it....
http://www.eaton.com/Eaton/ProductsServ ... PCT_338418