Yah that nut is a little tricky to get at. You have get a socket on it and move the ratchet along the inclined plain of the coil. That might not make much sense now, but when you get to doing it you will see what I mean.
I just recently put a 4" lift on my 87 (already wishing I had gone with the 6") and that nut was a bastard to get of even using the method seabronc described above. Is there a special tool for this job?
Shadow_D I bought the 4" version of the one your talking about and its a good kit. Ride quality is awesome and it comes with everything except the extended brake lines for the 6" likt.