No firsthand experience with the WJ's but I havn't seen a lot of kits for them ... mostly the ZJ's. The kits I have seen are 2" and under and do not include control arms. The pictures however show the wheels and axle pulled a bit close to the body. I'm affraid at 3" you would have to get at least lower control arms.
I'm affraid the axle and tires would just be pulled too close to the body w/o them ... someone feel free to correct me with firsthand experience tho.
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