Bringing this thread back from the dead as I have (what I assume to be) a driveline clicking/ticking while driving. Researching the forum this morning leads me to believe that I need to start my disgnostic/service work by greasing my U-joints to see if the situation improves, and if it does, I suppose I should plan to replace the U joints. I do not believe this to be a flex plate issue, and I believe a wheel bearing would whine instead of click/tick/knock. The sound increases and decreases with the speed of the vehicle. I'll double check the lug nuts, wheel center caps, and then go from there. Any other suggestions? I've got a serious itch for a 5th gen 4x4 so this old girl and I may just part ways later this year.