I thought I would share the results I got when lowering my Panel.
Its a 61 so the front was easy. Just adjusted the torsion rods. In the rear I wanted about a 4" drop, but also wanted it to ride softer. After some research I got rear springs from Classic Industries. They are 3" lowering springs for a regular C10. These lowered the rear of my panel 4" and the ride is much softer now. I am going to add some helper bags for when I need to carry a load.
Here are some pics:
Stock Panel spring next to 3" truck spring:
Before and after shot:
After shots:
Compared to my wife's Toyota Sequoia: