If you're looking to really lower the front down, put suspension Maxx keys in it. You can reclock them to go very negative. Here's a pic of the angles on my buddy's truck. 4" tuff country on a 2002 gmc. He runs 33x12.50's on 20x10's for daily driving and 35/12.50's on 17x10's for pulling.
Right now my axles are a half inch positive from bein level.. I think I like it there.. Got my wheels and tires ordered this mornin.. Be in and on next week.. Gonna be tasty lookin