I just got a kit on the cheap and I'm 50/50 if I want to install it or pass it along. I don't plan to use the rear leafs at all and wanted to know if a perches are needed for a spring over axle?

In this photo they just flip the spring and reused all the OEM apart but the sway bar links.

Photo from Neo
Hummer4x4offroad.com

Also what angle does the drive shaft have to be to meet the axle? One more thing, I have an idea on how to install the kit but there's a bracket I have no clue where it goes os if you guys can help me out with the install kit manual that would be great.