Thinking about lowering..... a little...

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Ya a heavy half has hd springs. My rear spings have like 10 leaves and an overload. In the pic as a longbed it is set at 3", the shortbed pics are at 4" in the rear. Only my shackles are adjustable. The hangers give you 2" drop and the shackles can give a 1" to 2" drop.

If you going to just level it out I would go with shackles. You have to drill out the rivits to change the hangers and its a real PITA. A shackle kit would give you the ability to adjust it if you didnt like the full 2". I havent seen adjustable hangers, but I'm sure they make them. I got all my stuff from sport truck direct for like $350, but that was a few yrs. ago. Its all Western chassis stuff and I have had no problems with it. You can do either or, but I would do shackles they are the easiest. You wont need to change shocks either.