I used a main leaf and load leaf from a dodge durango pack i got from the junkyard. i weaved in some leaves from a BII pack to make a 6 leaf pack. I clamped it in front of the axle and am using a spring guide in the back to keep the leaves from shimmying side to side without sacrificing droop travel, the closer center clears the gas tank but allows more travel with the stock slip yoke and helps with my pinion angle a bit.
the pack tends to like to stay arund 12-13 net travel which is about all I could hope to get with the length of the main leaf. it handles well, and rides super well. valving the rear shocs to work with the pack better has made a missive difference as well as adding weight behind the axle.