I can vouch for this method. My GF's dad showed me this trick when I did my balljoints. Just back the nut off and smack the knuckle on the side with a 3lb sledge (may take a few smacks) and the tie rod will literally fall out.
Now on a slightly different note, does anyone have a good, foolproof method for taking apart ball joints (upper or lower) WITHOUT using a pickle fork/destroying the grease boots? That's why mine were shot. I had opened up my front end at least twice, trying different springs, and the boots took a pounding. Yeah I know about the LCA bushing version of that job but let's assume that isn't an option. When I did my ball joints recently, I DID need a pickle fork to separate the stud from the knuckle, in spite of pounding.