The Hotchkis springs give a little stiffer ride. Other than that, I don't know that there is much difference. I don't have any experience with the Belltech, but I'm sure they are also a quality spring.
I run Belltech's but have no idea about the dif between the two are cause I've never run Hotchkis. If you're wanting a 4" drop you can go with hangers and shackles. I ran them cause I wanted a five. But the leafs are easier to install IMO. No cutting of those damn rivets on the hangers!!
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