Check out my build, I think i have the specs on there!!! the rears were free (off the back) and the chevy's were $75 from the wrecking yard.... sky sells a good chevy spring bracket kit and i used marlins kit upfront but used marlins rear hangers under the frame for the front! my front has 7 leafs right now but i am going to repack them with a couple stiffer chevies for more uptravel to my bump stops.... they work vey well! Its one of those experimentation deals.... just play untill they work how you want them too!