Finally did the install and to do it right takes a lot of time. The first thing we did was completely disassemble the springs and cleaned them with a hot water power washer and some degreaser. We then hung them after brake cleaning to get them ready to paint. After 3 good coats of paint and allowing to dry overnight they were reassembled.
In order to get the front spring bolt out, the fuel tank has to be removed and there is very little room to work in order to remove it. The filler hose and the Evap. line are very short and you can damage both of them if not very careful. If you brake the plastic T connector for the Evap line, you have to replace the entire Evap line assy. on top of the fuel tank so be very careful with it. The exhaust can be moved out of the way to do the passenger spring install by just removing the front 2 bolts behind the Cat. system.
Before the spring install do yourself a big favor and drill a 3rd hole in the lowering shackles provided by WSI. You will need it if your as particular as I am. You can adjust the rear spring height in the shackle without removing the springs again but to get the height I wanted, I needed a 3rd hole located 1 inch below the second hole. If you don't do this, you may need a 1 inch block under the spring. The factory shackles make the rear to high unless you plan on carrying 300 pounds all the time.
After the job was completed we test drive the truck in some fields to see how the back reacted as compared to stock. I have only tested it a short time but in my opinion this should be the first mod to all of these trucks no matter who's springs you choose to use. This ended up being a 7 hour install to do it right including any touch up to paint scratched during the install. There is no more hop in the rear and it rides much better. Let me know if you have any questions. I will post some actual measurements later.