[modblacksmith]

As far as running 8 inch springs with a shackle flip I'd check out ORD web site if you allready havn't. They say to run the 2.5 flip with a 6 inch shackle so the deep arched springs dont flip forward or back when extended under a load. When I did my shackle flip for 8 inches of lift it moved my rear axle forward quite a bit so I built zero rate blocks with off set pins to move it back. You can buy these from ORD and I think Sky makes them too. If I go any higher with mine I think Im going to build new rear end front hangers to drop them down so the axle stays centered.
I was thinking of using the same kit for the front of my truck too, I'd like a couple more inches so I can run 42s. I want to change out my hay wagon springs for some soft ride 6 inch springs plus the kit for a total of ten inches.
My roommate purchaced the Sas kit from Sky and I was very impressed with there quality, peaces are keyed into each other so they can't move. I'll prop end up copying theres and building my own cause I'm cheep like that, hahaha.

Hope this helps.