I have a full traction spring over kit that I bought for my CJ sitting on a shelf in my garage. I've put it on, and taken it off twice because it ended up putting too much lift on my jeep. The first time I put it on, I had a 4" spring, and a 1 1/2" shackle. The second time I had a 2 1/2" spring and a 1" shackle. After talking to my old boss who has a '88 YJ, I'm going to do the same thing he did, and put a good set of stock springs, a 1" shackle, and the SOA. He's clearing 36" M/T Baja Belted's, and I'll be running 36" Thornbirds. Hope that helps. :)