I was looking on DJM's website for 4" drop shackles today and got a bit discouraged. If I want to go with a 4" drop in the back, will I need to notch the frame? Is 3" the lowest I can go without having to modify the rear end? I'm looking for just a simple drop so I can still use this as a DD. The 2" DJM spindles are on the way and I'm still trying to find a 1" drop spring. Anyone care to chime in??