Yes it can be done but it is time consuming and expensive. KJs are unibody and IFS (independent front suspension), so you can't just sling a solid axle under it, connect the control arms and call it good. When my wife had her '05 Renegade, I was going to SAS it but after looking at all of the variables and potential issues we traded her KJ in for a TJ. If you have limited mechanical knowledge and little fabrication skill, this is not a swap I would recommend you tackling by yourself.
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