If someone is thinking going SFA with stock width axles, if starting to stock pile parts, and near Colorado, there is a guy selling a Ford 8.8 with MORE TJ bracket kit, Powertrax Lockright, and 4:88 gears. Ford 8.8 are awesome upgrades from even TJ Wrangler D44's, have 31 spline axles, same 5x4.5" bolt pattern, and Disc brakes. The 8.8 even has the speedo sensor in the housing, so I don't know for sure, but could be adapted to work in the KJ. Complete 8.8's are going for around $350 around here, MORE TJ bracket kit is $300, the Powertrax Lockright is around $330 brand new from SummitRacing, and depending what brand gears, those are atleast $150. That's $1130. He is selling it for $700.
http://www.colorado4x4.org/vbb/showthread.php?t=133953