I've ran 2" drop with no problems, by having the beams heated and tweaked a little. I think that's about the limit, and it's more like 1.5", if I remember right.
That's the way we used to do it...
Now we've got stuff like this
http://www.djmsuspension.com/Product...3F150Parts.htm
I've been thinking about getting some new beams myself, but I think I'm just gonna get some drop springs, and a hanger kit for the back... that is, if I bother to lower it any.
[addsig]