This should cover what you are looking for.
http://home.earthlink.net/~stevenschreiber/jeep/tech/cabledis.htm[/QUOTE]
I used this writeup for a guide but I used an 8ft (only needed 6ft, FWIW) industrial grade cable that cost $30 from 6 States Dist. and re-used my existing shift fork. It only takes about 1.25" of throw to engage the axle collar and works well. I also removed the vac motor housing and used a piece of rubber hose and a copper tube cap to seal it off but still allow the rod the travel it needs. Search around the Web, there is another article that shows you how to chop up the Vac motor and reuse one end.
If you do a lot of mud or water crossings while wheeling, you'll want to use heat shrink tube or other mode of sealing where the cable enters the axle fork housing.