xroads

quick ? for the f150 folks. since i rolled my 97 f150 over, all i can do is salvage the running gear, all of which is in great shape. i have found an incrediblly pristine 1997 2wd, that is owned by an old man who can't drive anymore. what is involved in switching over to 4wd? is it worth the effort? all the 4wd's that i've looked at over the past 2 months have been rusted badly. what do you think? thanks.