shackle/hanger guys come in

[chevy-fun]

i just finished doing a McGaughy's shackle/hanger. i was looking for a 4" drop . i measured all four corners before starting. an it turns out i only got a 2.5" drop on both side. i did leave the leaf spring an shackle bolts LOOSE an jump in the bed an drove around the block a few times. no change in drop. i expected a 3-4" drop. not 2.5", is this something that will settle down later.

1. whats average drop with this kit
2. using stock shock- could that be my prob. even though plenty room still left

here is a few pix