My 2005 Navigator has 110K miles on it, and I'm starting to hear "clunking" from the front and rear suspension when I'm on rough pavement that I believe are simply worn bushings. My local service guy said he would simply "lubricate" them next oil change. My experience with bad bushings never included simply lubricating them -- if they're worn, they're worn. Anyway, has anyone done a "bushing" job on their Navigator? Also, which bushings are the most likely to be the problem -- my guess is that the Navigator has a ton of them, and I would prefer not to go on a quest to replace them all. Thanks for any help.