These springs were on my rig when I bought it back in 07 and I have no idea what they are (other than stiff!). The markings on the front spring lead me to believe that it is an aftermarket lift spring of some sort, but the rears don't have any identifying marks. Any guesses?
Front:
Rear:
Here's an old pic that gives you an idea of height (36" Iroks):
Front:
Rear:
Here's an old pic that gives you an idea of height (36" Iroks):