Black Diamond makes some great springs. Not sure if they have a 4" for the YJ though.
All they had when I bought mine (for my CJ) were 3" lift.
They flex like crazy!! But, if you run a hardtop and /or heavy rear bumper w/oversize spare, make sure you get a spring that reflects that.
Some of the better companies have different rate springs, for wether you run a hardtop, winch up front, etc.
The rear of my CJ started to sag after 2 years, becuase of the extra weight. I could have gotten new springs under warranty, but they couldn't guarantee it wouldn't happen again. So I just added a 4" AAL from a YJ, now my CJ sits level, and still flexes great.
I'd be leary of Rough Country, my buddy Ardens YJ's 4" lift sank 2 inches, while sitting in his garage over the winter!
And thier XJ rear leafs were doing the same as of last year.
Supposedly they 'fixed' the problem. But I personally won't chance it.
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