Explorers didn't go unibody until 2012 I believe, when ever the current generation started. As SVT said, 4406's are near bolt in, they're the case from 97-03 F-150's. Head over to the explorer forum, there are plenty of write ups there. I'll be watching this build, your ranger was pretty much exactly what I want mine to end up like, and I'm excited to see where this explorer goes.