515$ for the unit? Does that include the gears? Probably not. I would love to have one of those, but with my 2wd, and the minimal amount of 'offroading' it sees it would probably not suffice the cost of that system.
So new clutches and a friction modifier is what I am looking at. I should probably replace the axle bearings and everything too.. I guess I need to start adding all this stuff up.