[Mike C]

I have a 69 shot step Chevy with rear leafs. It has the HD 5 leaf springs. I flipped it with the DJM kit and it netted 7" drop. I pulled the overloads just because they hit the CalTrac bars.

If you want just 4" drop, suck it up and buy the drop springs. That leaves you the shackle option if you want to go a little further. When you flip you lower the thickness of the housing plus the height of the springs and then the mount. I had "guesstimated" at around 6" and netted a little more.

I'm very please with how my truck sits and rides. I did not notch but it will hit the shorty bump stops on really sharp hits.