[Portmod7]

I think you'll find that a pig-tail spring provides a lot of travel without coil-bind compared to an equally rated spring of another type. I put "beehive" valve springs on my engine to allow me to run some 1.6 ratio rocker arms, the original "traditional" style springs would have coil-bound. It's the same concept.

In my truck, with a 6" drop spring in the rear, there's really not a whole lot of space left to fit a spring between the arm and the frame. So if you're talking about simply swapping another spring into the stock location, I would bet you're going to have a hard time finding something that will fit, in the correct rate, without coil-binding over every bump or any time you put something in the bed.