Ok, you can go as low as 5 or even 6 inches without a notch, its been done. However, it will ride like crap. I am at a before and after standpoint, I had a 3/4 with no notch with bs still in and now i am bagged in front and 6 or 7 inch static drop in rear with a notch and it is excllent. With a flip kit your going to get a little more than a 3 out back. There really arent that many suggestions for a 4/5 without cutting the frame, you don't have to but I would reccomend it.
1997 Ford Ranger XLT
DJM 3/4, Bagged using Airlift Gen II Extremes,Monroe/Toxic shocks/2inch shackle flip/60/40conversion,White gauges/KP air gauges, clear corners/euro diamond headlights, exhaust dumped,tint,stubbie antenna