Honestly I didnt measure castor, I put the kit on and it worked fine. i bought it with the intentions of getting adj arms and doing the rest then stuff happened and i wasnt able to do it for over a year.
My point isnt that its right, my point is that it worked.
my XJ is currently at 3" with nothing more then springs and blocks and other then some axle wrap it works fine,and a coworker ran his ZJ at 5" for about a year on stock arms with no issues. I just havent ran into the problems people talk about.