I have converted over to all mono-leafs front and rear with a 3" drop axle in the front with 2" lowering blocks in the rear on top of the mono-leafs- You can run three in the rear but with no weight in the bed- I tried it all. The longest three will sag and eventually break-the front is worse though. Even with 4 leafs I had sag and it was too close to the frame. So If you are going the cheap route use the top 4 springs with blocks from jim carter. I think they are like 40$ with hardware. And if not invest in mono-leafs pricey but worth it!
