There are decent instructions for that in the Haynes manual for the XJ. If your buddy is going to be working on his XJ a lot, it might be worth a few bucks to pick that up. I used my Haynes manual quite often when I had my 2000 XJ. It was the first vehicle where I learned to do a lot of the maintenance myself. Unfortunately there isn't one for the KK or I would have bought it!
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997