doesnt this already have a 30 up front?
if you want to keep the 3 link dont extend anything. just build some new links, its not that hard. I dont know anyway around not having to extend brake lines when you increase lift and travel, that should be a given. Just get some full widths and build some spring packs to hang the springs. would be more stable with leafs. simple, easy and you can get almost all of it out of a junkyard.
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