Join Date: Sep 1999
Location: Palmyra, WI
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A SOA will give you lift equal to the diameter of the axle tubes + the thickness of your spring packs + about a half an inch from the distance that the spring pads sit off of the axles. At minimum you are looking at 4.5" to 5" of lift, which is plenty of lift for 35"s on a CJ. If you go to Wrangler springs, this will reduce a bit as the YJ springs lay 'flatter' than the CJ springs do.
The hard part about a SOA is getting the steering right. Some fab skills are required and a deep understanding of steering geometry helps alot! If you can tackle this yourself, then have at 'er! If you have to pay someone to do, even just the steering stuff, you are cheaper off with a 4" lift and a drop pittman arm. This won't give you the flex of a SOA with stock springs, but it's cheaper. You will have to weigh the considerations before going any further.
BTW, welcome to the best Jeep board on the net for friendly and very good tech info!