That is the kit a lot of guys have used....seems pretty good. I'll probabably make my own. Probably be cheaper just to buy them though....
I have heard of a few people doing the SD frts, but it does not seem like it is worth the work. The stock springs are not short. Not sure how much better the ride would be with a few extra inches (I give it 2 hours before that is quoted in a sig line
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Look at RE's SD springs. Their XJ leaves are pretty good, and well priced.