I just did this conversion.. i know people say dont use a fork but im telling you .. your destroying the ball joint anyway.. use a 5 lb mallet and a fork .. it WILL come off ..
do not be gentle either. make sure to get the right size fork its the smaller fork that you want..
AL arms rock.. i just got them on and got my alignment. Something is different in the ride. havent put my finger on it yet. but its Defiantly different.

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03 liberty
Brushgaurd,Custom light bar ,CB, Custom Cargo rack, 245/75/16 BFG / and Skyjacker 3.0 inch lift (just updated from a 2.5 lift)
GPS, Infared Camera, Skids, ALS A arms, 8000lb warn winch ( not installed yet)
Bend oregon

In order to release the upper ball joint/UCA from the knuckle take a mallet (I use a 5 lbs mallet) and smack the knuckle where the ball joint goes into and it should release eventually. Smack it good, but dont smash it and make sure to hit the knuckle and NOT the UCA.

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Fran:2002 Jeep Grand Cherokee Limited 4.7 quadra drive. 31in General Grabber AT2, OME HD, bilstein, IRO sway links, addco rear sway. Kolak 3in cat back flowmaster SUV 50, magnaflow 3in cat, airaid JR kit, ram air, P.I.E. aux adapter, surco 45x50, husky liners.http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=6&t=65276&p=719908#p719908