Shackle flip with 2 wheel drive spring hangers is a no go. Since im going to have to use the 4 speed Allison I have, for now. I’m going to remove the flip and install my new 4x4 hangers with 8” springs. I’m worried that I will have to use a 3 inch body lift to fit the trans without serious firewall and tunnel modifications. I dont want to do all that work to put a different trans in down the road. At that point ill just install my flip and 12 inch front springs and remove the body lift.