Oops, I didn't see that you had a SM420 when I voted, so change my vote to ARB..
That is, unless an anti-wrap track bar can make the list, then I'd move that on top.
good point tim, i forgot about the anti-wrap bar as of right now the truck has an aussie locker up front but, i like the fact that you can unlock when you go over the obsticle you turn it off and turn no three point turn to get around thing's.have 40's now wes you diesel guy's geese..