an SOA is short for Spring Over Axle. in the OEM relations, the springs on the BIG jeeps on the front is place BELO the axle tubes. to lift the jeep without have the stiff springs normally needed via store bought kits, u can place the springs OVER the axle tubes. more engineering is needed for this type of lift on THIS type of jeep as no1 usually lifts the BIG jeeps to drive the trails.
i did an SOA to my 66 wagoneer only because no1 made a lift kit for it. it does great on the trail and rides nice on the street. the steering is a prob on an SOA. but many companies make kits to relocate the steering to above the springs. hicks 4x4 in SoCal comes to mind
take a look at me web site for a pic and bio.